Cable Matters48Gbps USB C to HDMI 2.1 Adapter, Supports 8K 60Hz / 4K 240Hz HDR, Thunderbolt 4 to HDMI2.1, HDMI 2.1 to USB C Adapter, Compatible with Thunderbolt 5 - Max Resolution on Mac is 4K@60Hz

Works great out of the box with my MacBook Pro M1 and LG C3. No more 30hz! Full 4k @120hz.

first unit did not work, seocns unit worked great.

Disclaimer:4k 120Hz is not supported out of the box, it will require manual tweakingThe process of enabling it is straight forward and requires less than 5 minutes of work.You will require a Windows machine with a thunderbolt3/4 port or DP over USBC capabilities.The firmware and instructions are found online after searching:DP/USB-C/Thunderbolt 3/4 to HDMI 2.1 4k@120hz RGB4:4:4 10b HDR with Apple Silicon M1/M2/M3 now possible !The Cable Matters USB-C to HDMI 2.1 solved all my issues. I've long wanted to embrace the one cable life with my Macbook but always had to compromise. All docks I've come across are limited to 4k 60Hz when connected to Macs just like the HDMI port on the device itself.This adapter was outstanding and singlehandedly resolved my issue. Using the firmware update tools and an older firmware version I was able to utilize the Thunderbolt 4 ports on my dock and display 4K 120Hz HDR to my TV.If you're planning to replicate this, for the smoothest experience ensure the adapter is the 201388-A model and you're using a certified HDMI 2.1 cable.The build quality on the adapter is great. The aluminium shell dissipates the heat from the chip inside the adapter and allows it to run significantly cooler than other products I tried.I was so happy with this adapter that I ordered another one straight away. I recommend this adapter to everyone.

EDIT: After some tech support was able to point me in the direction of a firmware update, I was able to get the device working at the desired resolution and refresh rate. The device had problems with Intel Gen 11 and an update to the firmware resolved the issue. However, if you try to find the device with the model number (201388) on their website, you will not be able to find it. Instead, you will have to look in the 'Knowledge Base' portion of their website and find the VMM6100 firmware update. This relates to the chipset. If you google, 'Cable Matters 201388 Chipset', you'll see VMM7100 chipset, which is incorrect. This is an utter mess! But was at least able to resolve the issue in the end!OLD REVIEW: *Could never get anymore than 1080p out of this*Only getting 1080p@60hz with this converter. I have the correct HDMI cable (works @ 8k60) and Thunderbolt 4 connection. In the end I had to buy another cable, USB-C to DisplayPort and now I am getting my desired resolution (2k@165hz).

Purchased this so that I could use my M1(Pro) Macbook Pro with a 120hz 4K Monitor over HDMI. This isn't supported by default and when you plug in to the integrated HDMI port, you are limited to 60hz. Delighted that when I received this adapter, 120hz 4K over HDMI was supported by default - I didn't even need to update the firmware as some online forums suggested. I guess these newer built devices are shipping with the newer firmware by default. Couldn't be happier. No longer need to manually switch Displayport on my monitor!

Bought this specifically to get 120Hz out of my M1 Pro Macbook Pro as I had moved to a LG C3 42 inch TV as a monitor. Asked to confirm this was the right one (it was) and they sent the instructions for how to apply and update. All done, and it worked straight away with my Sony TV (as a test).However when I got my C3, I could only get 30Hz out of it (using a known good cable that handled 120Hz directly on the PC straight off the bat and would do 60 Hz straight from the Macbook). Contacted Cable Matters and within the day I received a brand new firmware update which worked and I got 120Hz with the LG C3. They even confirmed that it would work with the latest update of Sonoma.Note: You will need a USB-C or Thunderbolt connection which supports DP Alt mode so don't get disheartened if it doesn't work after the update.A great product backed by fantastic customer service from Cable Matters (all responses were within the day). Special shout out to Grace from Cable Matters who was brilliant!

When my computer is on, I can plug this adapter into my Asus Strix RTX 2080Ti usb port and plug the 2.1 HDMI cable into my Samsung Neo Qled tv and I can get 144hz no problems. The problem is, I can’t boot up with this installed as it always gives me a bsod on boot up. I have to remove it completely and plug my HDMI cable into the graphics card for my computer to clean boot.

Reviewing this based on it's 4K 120Hz ability so anything else isn't relevant.Bought this as it's pretty much the only game in town (Fully Certified 2.1 compliant) so far from what I can see available TBH.I wanted to Tap my gaming laptop's USB C port & feed it into my big TV as I wanted to check out the TV's gaming abilities at that 4K 120Hz spec. I ordered this & upon prompt arrival I connected everything up & that was that, job done really. Laptop has a 3070 card + a 48Gbit USB C out port & the Sony TV had x2 HDMI 2.1 certified ports.This little device worked 1st thing & it does exactly what it claims & allows me to game at 4K 120Hz on the big screen instead of always gaming on the far smaller laptop display.It hasn't faltered once. It appears solidly built & it's In + out plugs/ ports are nice & robust too.It's even quite pleasing to the eyes for such a device & has no horrible plastic'y parts.I honestly can't think of anything even slightly negative to say about the thing.So for 30 Quid it's well worth the outlay if you're like me & looking to get 4k 120Hz without an HDMI 2.1 output port.To sum things up then = Well worth the money, built well & does exactly as it claimed :)I can Highly Recommend this little device :)