Cable Matters 8K DisplayPort 1.4 to HDMI Adapter with 4K@120Hz or 8K@60hz, Unidirectional (DP 1.4) Display Port to HDMI port 8K Cable Adapter in Black, Support for RTX 3080/3090, RX 6800/6900 and More

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 DisplayPort to plug in and flash the adapter.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 DP 1.4 port 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 102101-BLK model and you're using a certified HDMI 2.1 cable.The build quality on the adapter is great, even though it's made of plastic it is durable and doesn't get as warm as other adapters.Highly recommend this adapter!

EDIT 05/01/2023: The new 528.02 driver that just released today has made this adapter fully working with full RGB, 10 bit HDR at 4K @120Hz on my 4090! The cable I am currently using is the "StarTech.com 16ft (5m) HDMI 2.1 Cable 8K - Certified Ultra High Speed HDMI Cable 48Gbps - 8K 60Hz/4K 120Hz HDR10+ eARC - Ultra HD 8K HDMI Cable - Monitor/TV/Display - Flexible TPE Jacket (HDMM21V5M)" in case anyone is having trouble getting full RGB, hope this helps!For some reason, my 4090 stopped being able to send signals to monitors via HDMI port so this fixes the issue since my DP ports still work.The only caveat to using this adapter is that DP 1.4 has lower bandwidth than HDMI 2.1 so you are forced to use chroma subsampling with 4k@120Hz and you absolutely cannot enable HDR too. If you also want HDR then you have to drop it down to [email protected]'s a good temporary fix for sure, I can at least use my primary display again which is an LG OLED TV, but definitely not good for a long term solution.

Only used it for audio, to connect to my AVR. Surely a low-bandwidth scenario? Well, there were constant interruptions, every few seconds. Even after updating the firmware. Completely unusable, sadly. I'm returning this.

I bought this for the purpose of being able to use 4K 120hz on my LG C9 with a GTX 1070 to play some Older Games in crisp 4K and it worked straight out of the box for me. All I did afterwards was enable 10 bit colour in the Nvidia Control Panel, as well as enabling HDR when I need it for certain games ( HDR works great with the adapter at 4K 120hz ) .The only issues I've had with the adapter is the screen can sometimes cut out when exiting a game ( Hasn't happened often ) or when using Custom Resolution Utility to setup 1440p which requires a restart to get the image back, GSync also isn't supported with the adapter either. But other than that, couldn't be happier with the result.

Go to DP -> HDMI adapter. Well built, reliably works on most devices tested on. Apparently there is a firmware update for this dongle (!?) from Cable Matters' website, but have not tested this yet.

This was the 3rd adapter I tried and the only one that actually worked for 4k 60fps HDR. Highly recommended.

Appears well made but disappointing colour depth (4k 120hz YCbCr 420) and no G-sync for this price is a no go for me.

I don't know whether to blame the cable or not as this is the second adapter from a different brand that hasn't worked and yes I have checked the cable and tv can send 4k 120hz but this only allows 1080p 60hz with no sound. I repeat I don't know whether this is the adapter or if something is up with my actual graphics card.