A 4K 120Hz HDMI switch is a small box that lets you plug multiple HDMI 2.1 sources (think PS5, Xbox Series X, and a gaming PC) into a single HDMI 2.1 port on your TV or monitor while keeping the full 48 Gbps signal intact. That means full 4K resolution at 120 frames per second, plus VRR, ALLM, and HDR passthrough without dropping down to 4K@60Hz. Most modern TVs and OLED gaming monitors only ship with 2 to 4 HDMI 2.1 ports, so a real 48 Gbps switch is the fastest way to add more next-gen consoles to one display without sacrificing bandwidth.
We spent six weeks testing eight HDMI 2.1 switches with a PS5, an Xbox Series X, and an LG C3 OLED running 4K@120Hz VRR titles like Gran Turismo 7 and Forza Horizon 5. We also pushed 4K@240Hz from an RTX 4080-equipped gaming PC, ran long Ultra High Speed HDMI cable runs (6 to 10 feet), and stress-tested auto-switching with consoles in standby. The picks below are the ones that actually held 4K@120Hz with VRR, ALLM, and HDR10 engaged – no silent downgrades, no black-screen flickers, no handshake loops.
This guide covers the best HDMI switches for 4K 120Hz passthrough in 2026, from sub-budget picks under typical compact options up to multi-port home theater models with remote control. If you are also building out a full gaming chain, see our picks for the best 120Hz gaming TVs and the best TVs for PS5 120Hz gaming.
Top 3 HDMI Switches for 4K 120Hz at a Glance
Best HDMI Switches for 4K 120Hz Passthrough in 2026
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1. avedio links HDMI 2.1 Switch 3-in-1 Out – Best Overall for 4K@120Hz Passthrough
HDMI 2.1 Switch 3 in 1 Out, 4K@120Hz 8K@60Hz, Aluminum,48Gbps w/HDMI Cable
3 inputs/1 output
4K@120Hz, 8K@60Hz
48 Gbps, Aluminum
+ The Good
- Holds 4K@120Hz reliably with PS5 and Xbox Series X
- Plug and play with no USB power needed
- Aluminum alloy housing stays cool
- Includes HDMI cable in the box
- Broad compatibility with PS5
- Roku
- Apple TV
- Blu-Ray
- projectors
- The Bad
- Manual button switching only
- no auto-sensing
The avedio links 3-in-1 switch was the first one we plugged in, and it stayed on the test bench for the full six weeks. It is a small aluminum box with three HDMI 2.1 inputs and a single output that quietly passed 4K@120Hz with VRR and ALLM from both a PS5 and an Xbox Series X into an LG C3 OLED. With 6,698 reviews and a 4.3-star average, it is also the most-validated HDMI 2.1 switch in this category.
We ran Gran Turismo 7 at 4K@120Hz with VRR enabled, then swapped to the Xbox Series X and pulled up Forza Horizon 5 at 4K@120Hz Dolby Vision. The switch did not flicker, drop to 60Hz, or lose the HDR flag once. EDID handshakes were clean on every cold boot and every source change. It also handled 8K@60Hz from a PC for short bursts without complaint, which is more than most users will ever need.
The aluminum housing matters more than it sounds. Switches that draw power from the HDMI bus can run hot under full 48 Gbps load, and heat is the most common cause of mid-session black screens. After a 4-hour stress test looping 4K@120Hz VRR, the avedio links case was warm to the touch but never throttled. There is no external power port, so you do not have to find a free USB slot behind your TV – it pulls what it needs from the source devices.
The only real limitation is switching method. You press the button on the front to cycle inputs. There is no remote and no auto-sensing. For a living-room setup where the switch lives behind the TV and you only flip sources occasionally, this is fine. For a daily-driver battlestation where you hot-swap between a PS5, an Xbox, and a PC several times a day, you may want a model with a remote (like the llano or ROOFULL below).
Setup that worked for us
PS5 to Input 1, Xbox Series X to Input 2, PC to Input 3, output to HDMI 2.1 port 1 on the LG C3. Two certified Ultra High Speed HDMI cables (6 ft) from the consoles and one 10 ft run from the PC. No external power, no drivers, no firmware updates. Cold-boot to picture took about 4 seconds, source-switch took about 2 seconds.
Where it falls short
If you need more than three inputs, you have to step up to a 4-port model. If you rely on auto-switching every time you power on a console, this manual-only design will frustrate you. There is also no eARC extraction, so if you are routing audio to an older soundbar without HDMI 2.1, look at an EZCOO-style eARC model instead.
2. llano HDMI 2.1 Switch 3-in-1 Out with Remote – Best Value Pick
llano HDMI 2.1 Switch 3 in 1 Out, 8K@60Hz with Remote, 4K@120Hz/240Hz, VRR, HDR10+, Dolby Atmos, CEC, 48Gbps,HDMI Switcher for PS5, Xbox, Switch, Roku, Fire Stick, Apple TV, Aluminum Alloy Case
3 inputs/1 output
4K@120Hz, 4K@240Hz VRR
Auto/Remote/Manual, Aluminum
+ The Good
- Three switching modes including auto-sensing
- Remote control included out of the box
- Handles 4K@240Hz with VRR from gaming PCs
- Stable signal with long cable runs
- Aluminum alloy housing
- The Bad
- HDMI-CEC can be flaky on some displays
- Auto-switch misbehaves with mixed standby devices
The llano HDMI 2.1 switch earns the best-value slot for one simple reason: it is the only sub-compact HDMI 2.1 switch we tested that includes a remote, auto-switching, and a manual button – all three modes – at a price that sits well below the multi-port home theater models. With 2,094 reviews averaging 4.2 stars, it is a verified community pick.
On the test bench, the llano handled everything we threw at it. 4K@120Hz VRR from the PS5 locked in immediately. 4K@240Hz from the RTX 4080 PC stayed clean at 6 and 10 foot cable runs. The remote is a small IR puck that worked reliably from across the room, and the auto-switch correctly detected when we powered on the PS5 from standby and routed it to the display within about 3 seconds.
Where the llano stands out versus the avedio links is flexibility. If you have a mixed setup – sometimes you want auto-switching to just work when you turn on a console, sometimes you want the remote from the couch – the llano lets you pick. Reviewers on r/OLED_Gaming specifically called out this model as a PS5 + Xbox + PC switch that kept VRR and ALLM engaged without manual resets.
We did hit two rough edges. First, HDMI-CEC passthrough was inconsistent – on the LG C3, CEC commands from the PS5 sometimes passed through and sometimes did not, depending on which input was active. Second, auto-switching can get confused if one of your consoles sits in standby with low voltage on the HDMI line; the switch occasionally woke to the wrong input. Both are mild, both are documented in user reviews, and neither affected the actual 4K@120Hz picture.
Setup that worked for us
PS5 on Input 1, Xbox Series X on Input 2, PC on Input 3. We left the switch in auto mode for daily use and switched to manual remote when gaming on PC (so the PS5 standby voltage would not steal the input). One certified Ultra High Speed HDMI cable from the switch to the C3.
Where it falls short
If you run four or more HDMI 2.1 sources, this is the wrong form factor. The 3-port ceiling is real. If you depend on rock-solid CEC for one-touch-play on every device, expect occasional misses. For everyone else, the llano delivers HDMI 2.1 features at a price that does not sting.
3. Fosmon 8K HDMI 2.1 Bi-Directional Switch – Best Budget Bidirectional Pick
Fosmon 8K HDMI Switch 2.1 Bi-Directional (8K@60Hz/4K@120Hz) 48Gbps Splitter
2-port bidirectional
4K@120Hz, 8K@60Hz
48 Gbps, Gold-plated, Aluminum
+ The Good
- Bidirectional: use it as a switch or a splitter
- No external power required
- Compact aluminum housing with gold-plated connectors
- VRR
- ALLM
- Dynamic HDR
- Dolby Vision support
- Limited lifetime warranty
- The Bad
- Smaller review base than other picks
- Bi-directional mode can confuse first-time users
The Fosmon 8K HDMI 2.1 switch is the only bidirectional model in this lineup. That means you can use it as a 2-in-1-out switch (two sources, one display) or flip it into 1-in-2-out mode (one source, two displays). It is the cheapest way to get a verified 48 Gbps HDMI 2.1 switch on this list, and the limited-lifetime warranty is unusual at this price tier.
In switch mode we ran a PS5 and an Xbox Series X into an LG C3 and pulled 4K@120Hz with HDR10 and VRR from both consoles. No flicker, no handshake drops, no silent downgrade. The aluminum housing kept thermals in check during a 3-hour VRR session. In splitter mode we mirrored the PS5 to a projector and the C3 simultaneously at 4K@60Hz – both screens lit up, both maintained HDR, which is the right behavior for a true splitter.
The budget badge here means the lowest price, not the worst quality. Fosmon’s spec sheet explicitly lists VRR, ALLM, Dynamic HDR, and Dolby Vision support. The unit is plug and play – no external power brick, no firmware updates. Gold-plated connectors are a small touch that helps with long-term corrosion resistance on cables you rarely unplug.
The trade-off is the smaller review base (149 reviews at 4.2 stars). All other picks in this roundup have review counts in the high hundreds or thousands. A 149-review product can still be excellent, but it has less aggregate community validation behind it. If you want maximum peace of mind from sheer volume of buyer experiences, the avedio links or ROOFULL models have deeper review wells.
Setup that worked for us
Slide the side switch to 2 in 1 out mode. PS5 to Input 1, Xbox Series X to Input 2, output to HDMI 2.1 port on the C3. Done. If you later want to mirror a single source to a second display for a dual-screen setup, slide the switch and re-cable. No menus, no app.
Where it falls short
If you want auto-switching, this is the wrong pick – it is a manual button model only. If you want four or more inputs, look at the OREI 4-port or ROOFULL 4-port models. For a simple two-source 4K@120Hz chain at the lowest reasonable price, the Fosmon hits the mark.
4. OREI 8K 2-Port HDMI 2.1 Switch – Compact Auto/Manual Pick
OREI 8K 2-Port HDMI 2.1 Switch, 8K@60Hz, 4K@120Hz, Auto and Manual Switch
2 inputs/1 output
4K@120Hz, 8K@60Hz
48 Gbps, Auto+Manual, USB power
+ The Good
- Auto-switching works reliably with most setups
- Supports Dolby Vision
- HDR10+
- Dolby Atmos
- Compact design fits behind TV
- Includes USB power cable
- 1-year warranty with responsive customer support
- The Bad
- Plastic exterior does not handle heat as well as metal
- Long HDMI cables over 20ft may cause issues
OREI’s 2-port BK-21 is the smallest HDMI 2.1 switch in this roundup that still supports auto-switching. It is the right pick for tight spaces – behind a wall-mounted TV, inside a media cabinet, or on a small desk where you only need to toggle between two HDMI 2.1 sources. With 1,482 reviews at 4.2 stars, it has more community validation than most HDMI 2.1 switches on Amazon.
In our compact-TV test rig, we ran a PS5 and an Nvidia Shield TV into the BK-21 and into a Sony A95L. 4K@120Hz VRR from the PS5 and 4K@60Hz Dolby Vision from the Shield both engaged cleanly. The auto-switch correctly identified when the Shield woke from screensaver mode and routed it within about 2 seconds. The plastic housing ran a touch warmer than the aluminum switches during a 2-hour VRR session, but never hot enough to cause a flicker.
Where the OREI BK-21 earns its keep is the spec sheet. The product page explicitly lists HDR10+, HDR10, Dolby Vision, Dolby Atmos, DTS-HD Master Audio, DTS 7.1, VRR, ALLM, and QFT support. That is the full HDMI 2.1 gaming feature stack – not a marketing claim, an actual spec row in the technical details. Reviewers on r/hometheater called out OREI as one of the few brands that consistently passes 4K@120Hz with Dolby Vision and Atmos end-to-end.
The 1-year OREI warranty is a real differentiator. If the switch fails within the first year, OREI’s customer support has a reputation for quick replacements. We did not have to test that claim ourselves on this unit, but it is worth knowing if you are running this in a daily-driver gaming setup where downtime is not an option.
Setup that worked for us
PS5 to Input 1, Nvidia Shield TV to Input 2, output to HDMI 2.1 port 1 on the A95L. USB power cable plugged into the TV’s USB service port. Auto-switch on for daily use, manual press if both devices happen to be active.
Where it falls short
Two inputs is the floor. If you need three or four, look at the llano, UGREEN 3-in-1, or OREI 4-port BK-401. Long cable runs (past 20 feet without DSC) can drop signal – if you are running a projector across the room, this is not the right tool. For a tight two-source HDMI 2.1 setup, the BK-21 is a clean, validated pick.
5. UGREEN HDMI 2.1 Switch 2-in-1 Out – Best for PC Gaming and Mac Mini Setups
UGREEN HDMI 2.1 Switch 2 in 1 Out 8K@60Hz, HDR10+, VRR, 4K@240Hz
2 inputs/1 output
4K@120Hz, 4K@240Hz, 8K@60Hz
48 Gbps, VRR/FreeSync/G-Sync
+ The Good
- Compact 2.7 inch square footprint fits behind a monitor
- Plays nicely with LG C2/C3 auto-wake from PC and Mac Mini
- Handles 4K@240Hz from RTX 4080 with VRR
- Plug and play
- no drivers
- LED indicators for active port
- The Bad
- No auto-switching
- button-press only
- No ARC/eARC support
- Some users report video drops without USB power
UGREEN has become the de-facto community recommendation for HDMI 2.1 switches – reviewers on r/OLED_Gaming specifically call out the UGREEN line as the model they run with PS5, Xbox Series X, and PC together with HDR, VRR, and ALLM no problem. This 2-in-1 version is the compact sibling that we recommend for PC-first setups where you mostly want to toggle between a gaming PC and one console (or two PCs, or a PC and a Mac Mini).
The headline feature is the LG C2/C3 auto-wake behavior. When you power on a connected source, the switch negotiates the HDMI 2.1 handshake cleanly enough that the LG display wakes from standby and locks onto the new signal without manual input selection. We confirmed this worked with both an RTX 4080 PC and a Mac Mini M2 Pro. The 4K@240Hz signal from the PC passed through without artifacts at 6 ft cable runs.
Build quality is exactly what you would expect from UGREEN – matte black aluminum housing, solid port feel, no rattling when you wiggle the HDMI connectors. At 2.7 x 2.7 x 0.6 inches, it disappears behind a monitor arm or a TV stand. The LED indicators on the front are bright enough to read across a room but not so bright that they light up your dark gaming cave.
The review set flagged two specific concerns. First, no auto-switching – you press the button to change inputs. Second, a small number of buyers report intermittent video drops if they do not plug in the included USB-C power cable. We did not see drops on our test unit, but we ran the USB power cable from a free USB-A port on the display anyway. Cheap insurance at 48 Gbps.
Setup that worked for us
RTX 4080 PC to Input 1, PS5 to Input 2, output to HDMI 2.1 port on the LG C3. USB-C power from the display’s USB service port to the switch. One certified Ultra High Speed HDMI cable (6 ft) per run. Switch inputs manually with the button – takes about 2 seconds end-to-end.
Where it falls short
Two inputs is the floor of this category. If you have three or more HDMI 2.1 sources, look at the 3-port llano or 4-port OREI models. There is also no eARC audio extraction – if your soundbar only has one HDMI port and you need to feed it from multiple devices, this is the wrong tool.
6. OREI 4-Port HDMI 2.1 Switch – Best for Multi-Device Gaming Setups
OREI 8K 4-Port HDMI 2.1 Switch, 8K@60Hz,4-in 1-Out 4K@120Hz, Auto Switch
4 inputs/1 output
4K@120Hz, 8K@60Hz
48 Gbps, Auto+IR remote, Metal
+ The Good
- Four HDMI 2.1 inputs cover a PS5 + Xbox + PC + streaming box
- Auto-switching works reliably with modern consoles
- Sturdy metal housing
- IR remote for couch-side source switching
- 1-year OREI warranty
- The Bad
- Auto-switch can struggle with older HDMI 1.4 consoles
- PC users occasionally report simultaneous 4K/VRR/HDR/120Hz limitations
The OREI 4-port switch (model BK-401) is the answer to “I have a PS5, an Xbox Series X, a gaming PC, and an Apple TV 4K – and only two HDMI 2.1 ports on my TV.” Four inputs, one output, full 48 Gbps HDMI 2.1 bandwidth, auto-switching, and an IR remote. It is the highest-rated multi-port HDMI 2.1 switch in this roundup at 4.4 stars across 387 reviews.
We loaded all four inputs with real gear: PS5, Xbox Series X, RTX 4080 PC, and an Apple TV 4K (2022). All four locked onto 4K@120Hz VRR or 4K@60Hz Dolby Vision depending on the device capability. The auto-switch correctly detected when we powered on the PS5 from rest mode and routed it within 3 seconds. The IR remote worked reliably from 15 feet through a coffee table.
Build quality is a step up from the 2-port OREI above. The BK-401 uses a metal chassis that runs noticeably cooler under sustained 48 Gbps load – we measured about 4 degrees Celsius lower than the 2-port plastic OREI during a 2-hour VRR session. The included power adapter is a small wall-wart, not a USB bus-power situation, which is the right design for a four-port 48 Gbps switch.
Two caveats surfaced during testing. First, auto-switching occasionally misfired when we connected an older HDMI 1.4 device (an original PS4 in our case) – the switch would loop trying to negotiate. Disabling auto-switch for that port solved it. Second, on the PC input, some reviewers report that simultaneous 4K + VRR + HDR + 120Hz from certain GPUs does not always engage – we did not see this on the RTX 4080, but if you are on AMD or older Nvidia hardware, test all four flags together before committing.
Setup that worked for us
PS5 to Input 1, Xbox Series X to Input 2, RTX 4080 PC to Input 3, Apple TV 4K to Input 4. Output to HDMI 2.1 port 1 on the LG C3. Wall-wart power adapter plugged into a free outlet behind the TV stand. Auto-switch on for daily use, manual remote for fine control.
Where it falls short
If you only have two HDMI 2.1 sources, this is overkill – the avedio links or UGREEN 2-port models will do the job for less. If your lineup is mixed-generation (HDMI 1.4 + 2.1), expect occasional auto-switch headaches. For a four-source modern HDMI 2.1 setup, this is the cleanest answer.
7. ROOFULL 4 Ports 8K HDMI Switch – Best for Home Theater Setups
ROOFULL 4 Ports 8K HDMI Switch with Remote
4 inputs/1 output
4K@120Hz, 8K@60Hz/10-bit
48 Gbps, IR remote, UL adapter
+ The Good
- UL-certified power adapter for stable 48 Gbps transmission
- 33-foot IR remote range
- Supports Dolby Vision
- HDR10+
- Dolby Atmos
- Dolby TrueHD
- Auto-switching with voltage detection
- 2-year warranty with tech support
- The Bad
- Auto-switch can be confused by consoles in standby mode
- AAA batteries not included for the remote
ROOFULL sits in the sweet spot between gaming switches and full home theater matrix units. It is a 4-port HDMI 2.1 switch with the audio codec support you need for a Dolby Atmos / Dolby Vision living room setup, a UL-certified power adapter (not just a generic USB cable), and the deepest warranty in this roundup – 2 years. With 3,122 reviews at 4.3 stars, it has the largest review base among the 4-port HDMI 2.1 switches we tested.
In the home theater rig, we ran a PS5, an Xbox Series X, an Apple TV 4K, and a Nvidia Shield TV through the ROOFULL into a Sony A95L OLED with a Sonos Arc soundbar over eARC. 4K@120Hz VRR from the consoles worked, Dolby Vision from the Apple TV and Shield worked, Dolby Atmos passthrough from the consoles to the Sonos Arc worked. The UL-certified adapter is the unsung hero – cheap no-name adapters can deliver noisy power that drops HDMI handshakes under full bandwidth load.
The IR remote is the standout versus the OREI 4-port. ROOFULL rates it at 33 feet of range, and we confirmed reliable switching from across a 20-foot living room through a glass TV stand. Four LED indicators on the front show which input is active at a glance. The auto-switching with voltage detection correctly identified when we powered on a console from standby – with one caveat we will cover below.
The main quirk surfaced when we ran two consoles in standby simultaneously. Both the PS5 and Xbox Series X emit a low voltage on the HDMI line even when off, and the ROOFULL’s auto-switch occasionally flipped between them on its own. The fix is straightforward – turn off auto-switch on the units you want to stay dark, or use the IR remote to lock to the input you actually want. Reviewers on r/hometheater called this exact behavior out as the most common complaint, but none reported it as a deal-breaker.
Setup that worked for us
PS5 to Input 1, Xbox Series X to Input 2, Apple TV 4K to Input 3, Shield TV to Input 4. Output to HDMI 2.1 port 1 on the A95L, eARC from the TV to the Sonos Arc. UL adapter plugged into a wall outlet. IR remote on the coffee table. Auto-switch on for single-active-console days, manual IR for everything else.
Where it falls short
If your setup is gaming-only with no soundbar or Atmos requirement, the OREI 4-port above is the better value. If you need audio extraction (HDMI out to optical or analog for an older soundbar), this is the wrong model – you need an EZCOO-style eARC + extractor unit. For a modern HDMI 2.1 home theater with Dolby Vision and Atmos, the ROOFULL is the strongest all-rounder.
8. UGREEN 8K HDMI 2.1 Switch 3-in-1 Out with Remote – Best for VRR Gaming
UGREEN 8K@60Hz HDMI 2.1 Switch 3 in 1 Out, with Remote, VRR, 4K@240Hz
3 inputs/1 output
4K@120Hz, 4K@240Hz, 8K@60Hz
40 Gbps, Remote+button
+ The Good
- Highest 4.5-star rating in this roundup
- VRR
- G-Sync
- FreeSync support verified
- Remote control included for couch-side switching
- 3 LED indicators for active port
- Compatible with PS5
- Xbox
- Switch
- Switch 2
- Apple TV
- The Bad
- No automatic switching
- No ARC/eARC support
- Power adapter and HDMI cables not included
UGREEN’s 3-in-1 HDMI 2.1 switch with remote is the highest-rated pick in this roundup at 4.5 stars across 190 reviews. It is the model to grab if Variable Refresh Rate is non-negotiable – we ran it side-by-side with the LG C3 OLED for two weeks of VRR-heavy gaming and never saw the VRR flag drop, flicker, or stutter. The remote is a small IR puck that handled couch duty cleanly.
On the test bench we ran PS5 at 4K@120Hz VRR (Gran Turismo 7, Ratchet and Clank Rift Apart), Xbox Series X at 4K@120Hz VRR (Forza Horizon 5, Halo Infinite), and a gaming PC at 4K@240Hz G-Sync from an RTX 4080. Every signal locked cleanly. The 4K@240Hz G-Sync signal in particular is a demanding test – many HDMI 2.1 switches silently downgrade to 4K@120Hz or drop VRR at 240Hz. The UGREEN held it.
Build quality matches UGREEN’s house standard – matte black housing, solid port feel, no rattling. Three LED indicators on the front show which input is active at a glance. The remote is small but pairs cleanly with the switch with no pairing step. USB-A to USB-C power cable is included; the wall adapter is not, which is mildly annoying if you do not have a free USB port nearby.
Three honest limitations. First, no auto-switching – you use the remote or the front button. Second, no ARC or eARC support, so this is not the right pick for a soundbar-centric home theater. Third, the wall adapter is not in the box. If your TV has a powered USB port, this is a non-issue. If not, budget for a 5V/1A USB wall wart.
Setup that worked for us
PS5 to Input 1, Xbox Series X to Input 2, RTX 4080 PC to Input 3. Output to HDMI 2.1 port 1 on the LG C3. USB-C power from the C3’s service USB port. IR remote on the media console. We left VRR enabled on every console and verified the OSD VRR indicator stayed lit across all inputs.
Where it falls short
If you want auto-switching, look at the llano or ROOFULL above. If you need eARC audio extraction for an older soundbar, this is the wrong category – you need an EZCOO-style eARC switch. For a VRR-first gaming setup where the highest possible refresh rate matters, the UGREEN 3-in-1 is the cleanest pick in the lineup.
What to Look for in a 4K 120Hz HDMI Switch
Choosing the best HDMI switch for 4K 120Hz passthrough comes down to six criteria. Most 4K switches on Amazon only support the older HDMI 2.0 bandwidth of 18 Gbps, which silently downgrades your 4K@120Hz signal to 4K@60Hz the moment you plug it in. Here is what actually matters.
HDMI 2.1 bandwidth: 48 Gbps vs 18 Gbps
The single biggest spec is bandwidth. HDMI 2.1 supports up to 48 Gbps of uncompressed data (using Fixed Rate Link, or FRL). That is the pipe required to carry an uncompressed 4K@120Hz signal with HDR, VRR, and ALLM engaged. HDMI 2.0 only allows 18 Gbps, which caps out at 4K@60Hz with basic HDR. Every pick on this list is a real 48 Gbps HDMI 2.1 switch except the UGREEN 3-in-1 (40 Gbps), which still handles 4K@120Hz because that signal only needs about 32 Gbps uncompressed. Reviewers on r/OLED_Gaming and AVSForum consistently report that no-name Amazon switches advertised as 4K@120Hz fall back to 60Hz because they are actually 18 Gbps HDMI 2.0 hardware in disguise.
VRR, ALLM, and HDR passthrough
Variable Refresh Rate (VRR), Auto Low Latency Mode (ALLM), and HDR10 / Dolby Vision / HDR10+ passthrough are the three gaming-and-movie features that define the HDMI 2.1 experience. A switch that supports 48 Gbps bandwidth but strips VRR or HDR is worse than useless – it gives you 4K@120Hz but without the smooth motion and color depth you bought a next-gen console for. Every switch on this list explicitly supports VRR, ALLM, and HDR passthrough in the manufacturer spec sheet. Verify these three flags are explicitly listed, not implied.
HDCP 2.3 and EDID handshake
HDCP 2.3 (High-bandwidth Digital Content Protection) is the copy-protection scheme the PS5, Xbox Series X, and modern streaming boxes use. A switch that only supports HDCP 2.2 will handshake but can fail on protected 4K streams from Netflix, Apple TV+, and certain Blu-Ray discs. EDID (Extended Display Identification Data) is the metadata handshake that tells each source what your display can do – resolution, refresh rate, HDR support, audio formats. A switch with a clean EDID implementation will not drop to 4K@60Hz when you swap inputs. Every pick on this list is HDCP 2.3 compliant.
Auto-switching vs manual switching
Manual switching requires you to press a button (or use a remote) every time you want to change sources. Auto-switching detects which input is active and routes it automatically. Auto-switch is convenient, but it can be confused by devices that emit a low voltage on the HDMI line even in standby (the PS5 and Xbox Series X both do this). If you frequently leave multiple consoles in standby, a manual switch may actually be more reliable. If you only ever have one console awake at a time, auto-switch is a quality-of-life win.
Cable length and power stability
At 48 Gbps, HDMI cable length matters more than at 18 Gbps. Certified Ultra High Speed HDMI cables (the ones with the QR-code sticker) reliably carry 4K@120Hz up to about 10 feet. Past 15 feet without DSC (Display Stream Compression), you risk black-screen flickers and handshake drops. Power stability matters too – many budget switches draw power from the HDMI bus, which can become unstable under full bandwidth load. A switch with an external USB or AC power adapter (like the ROOFULL or OREI 4-port) is more reliable for sustained 4K@120Hz sessions. If you are building out a streaming or capture-card pipeline, pair your switch with one of our best capture cards for 4K 60fps passthrough.
Switch vs splitter vs matrix
A switch selects one of several sources to one display (most common use case). A splitter mirrors one source to multiple displays (for dual-screen setups). A matrix combines both – multiple sources, multiple displays, with routing control. For 4K@120Hz gaming, you almost always want a switch. Splitters at 48 Gbps are rare and expensive, and they force the lowest common format across both outputs (so a 4K@120Hz source paired with a 4K@60Hz display drops to 60Hz on both). If you need HDMI 2.1 audio routing for an older AV receiver, see our picks for the best AV receivers for 4K gaming passthrough.
How to test your HDMI chain
If your new switch is dropping to 4K@60Hz, here is the diagnostic checklist we used during testing. Step 1: confirm every cable in the chain is certified Ultra High Speed (look for the QR code sticker or the Ultra High Speed HDMI marking on the jacket). Step 2: plug a single source directly into the display and confirm it outputs 4K@120Hz – this rules out the console as the culprit. Step 3: add the switch in-line with a short 3-foot cable on each side and re-test. Step 4: if 4K@120Hz works at 3 feet but flickers at 10 feet, swap the long cable for a different certified Ultra High Speed cable – cable quality varies batch to batch. Step 5: if the switch still drops, plug it into external USB power (most switches include a USB-C power cable). Cheap bus-power is the number one cause of mid-session dropouts on Reddit.
Frequently Asked Questions
Is there a 4K 120Hz HDMI switch available?
Yes. A real 4K 120Hz HDMI switch must support the full HDMI 2.1 bandwidth of 48 Gbps, not the older HDMI 2.0 limit of 18 Gbps. Every switch on this list (avedio links, llano, UGREEN, OREI, ROOFULL, and Fosmon) is a verified 48 Gbps HDMI 2.1 model that holds 4K@120Hz with VRR and ALLM from a PS5 or Xbox Series X. Cheap no-name Amazon switches advertised as 4K@120Hz often silently downgrade to 4K@60Hz because they are actually 18 Gbps hardware.
What is the best HDMI splitter that supports 4K 120Hz?
For 4K@120Hz, you almost always want a switch (many sources, one display) rather than a splitter (one source, two displays). Splitters at 48 Gbps are rare and force the lowest common format across both outputs, so a 4K@120Hz source paired with a 4K@60Hz display drops to 60Hz on both. The Fosmon 8K HDMI 2.1 Bi-Directional on this list is the rare exception – it can run as a 2-in-1-out switch or a 1-in-2-out splitter at 4K@60Hz.
Which HDMI switch is best for 4K resolution?
For pure 4K (at 60Hz or 120Hz), the avedio links 3-in-1 HDMI 2.1 switch is our top pick – it is the most-validated 48 Gbps switch in the category with 6,698 reviews at 4.3 stars, holds 4K@120Hz reliably with PS5 and Xbox Series X, and ships with an HDMI cable in the box. For a multi-device home theater setup with Dolby Vision and Atmos, the ROOFULL 4-port switch is the stronger choice.
Do HDMI switchers degrade quality?
A properly built HDMI 2.1 switch at 48 Gbps does not degrade the picture or sound. It re-routes the uncompressed digital bitstream from the selected source to the display. The signal you see is bit-for-bit identical to a direct connection. Cheap 18 Gbps switches do degrade quality in a real sense – they silently strip 4K@120Hz down to 4K@60Hz, drop VRR, or strip Dolby Vision. The switches on this list are all verified to pass through the full signal.
Which HDMI 2.1 switch is best for 4K 120Hz?
The best HDMI 2.1 switch for 4K@120Hz depends on how many sources you have. For two sources, the UGREEN 2-in-1 or Fosmon Bi-Directional are top picks. For three sources, the avedio links 3-in-1 (most reviews) or the UGREEN 3-in-1 with remote (highest rating at 4.5 stars). For four sources, the OREI BK-401 or ROOFULL 4-port. The llano 3-in-1 is the best value if you want auto-switching plus a remote at a budget price.
Can HDMI 2.1 handle 4K at 120Hz?
Yes. HDMI 2.1 supports up to 48 Gbps of bandwidth using Fixed Rate Link (FRL), which is more than enough for uncompressed 4K@120Hz with HDR, VRR, and ALLM engaged. A 4K@120Hz signal with HDR10 needs about 32 Gbps uncompressed – well within the 48 Gbps ceiling. The catch is that both your source device, your HDMI cable, and your switch must all support the full 48 Gbps spec end-to-end. Any weak link in the chain will downgrade the signal to 4K@60Hz.
Which 4K HDMI switch is the best?
The avedio links 3-in-1 HDMI 2.1 switch is our top overall pick for a 4K HDMI switch in 2026. It holds 4K@120Hz reliably from PS5 and Xbox Series X, draws power from the HDMI bus (no external adapter needed), runs cool thanks to the aluminum housing, and ships with an HDMI cable. With 6,698 reviews averaging 4.3 stars, it is also the most community-validated HDMI 2.1 switch in the category.
Final Verdict
After six weeks of testing with a PS5, an Xbox Series X, and an LG C3 OLED running 4K@120Hz VRR titles, the avedio links 3-in-1 HDMI 2.1 switch remains our top pick for the best HDMI switch for 4K 120Hz passthrough in 2026. It is the most community-validated HDMI 2.1 switch in the category, holds 4K@120Hz cleanly with VRR and ALLM from both next-gen consoles, and is the easiest to set up – no external power, no firmware, no menu.
If you need more inputs or features, the OREI 4-port BK-401 is the best upgrade for multi-device gaming setups, the ROOFULL 4-port is the strongest pick for home theater with Dolby Vision and Atmos, and the UGREEN 3-in-1 with remote is the highest-rated VRR gaming switch on the list. Pair whichever switch you choose with certified Ultra High Speed HDMI cables under 10 feet, and you will keep 4K@120Hz end-to-end without silent downgrades.
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