Cable Matters 48Gbps Unidirectional 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, Thunderbolt 5 Compatible - up to 4K@60Hz for macOS

Works as advertised: supports 4k 144hz 10-bit signal! The cable is much more flexible than I expected too, which helps keep strain off of the USB C port!

This is the second time that I buy a type c/display port to HDMI 2. The first one wasULT-WIIQ-US 6.6ft, DP 1.4a to HDMI 2.1. Unfortunately, this cable had audio issues, it stutters every 30 seconds and after 4 days it stopped working on 4k 120hz RGB. I researched a lot on these adapters and I found out that my RTX 2070 support type c video out display port alt mode, so I searched these adapters too. It seems that many of these adapters suffers from overheating, signal loss when switching in and out of HDR. Also, some of them require USB power. It seems the most of these adapters use the same chipset, but, it is the firmware that cause these issues. Then I saw that Cable Matters provide firmware update for some of the display port/type c to HDMI 2.1 that mention many bugs fixes related to issues that I mentioned. I decided to buy the short adapter and buy a hdmi 2.1 cable instead of the cable type, as the adapter is more expensive than the cable and it reduce the chance for it to stop working properly. The longer the cable is, there is a higher chance for failure. As soon I got it I download the latest firmware update from Cable Matters website and saw that the cable is on older firmware, so I update it . It takes very short time, and it works without issues. I can send HDR signal without losing signal, the audio does not have any issues and as I wrote in the title, it works on 4k 120 Hz 12 bit RGB. I will update the review if the adapter will fail.

Overall a good quality product. Successfully connected the HDR UHD LCD monitor of my upgraded Dell XPS 15 9510 running a film to my TV via one of my reverse-compatible Thunderbolt 4 USB-C type ports, this Cable Matters adapter, and a UGreen 48 Gbps 8K 2.1 HDMI 60 Hz Cable. Can confirm that 2.1 HDMI works very well at 60 Hz for 1920x1080p Full HD. No lags, good connectivity and image quality, and successful clear audio transmission. Currently using a NVIDIA(R) GeForce RTX(TM) 3050 Ti 4GB GDDR6 [45W] graphics card. This CableMatters device however, should definitely work for 10-bit 4K HDR UHD @120Hz but some people may be required to perform a manual setup, set up and apply an Nvidia settings custom resolution, or ensure that they have a GPU that supports 4k @120hz before this works. No drivers or external power supply required. For most, the computer will instantly recognise this device, there will be an immediate and unnoticeable installation, and simple plug and play. The cable does not seem to be able to achieve a top speed of 48Gbps but is nevertheless very fast, and from a viewpoint of practicality still does it's job very well. Quality of the male USB-C and female HDMI connectors is good and directly correlates to price paid. Quality of the aluminum protective materials is above average, and the cable although very short, on the cheap side, and slightly rigid, is both durable and user-friendly. So far no problems.

Overall the product works pretty well. I used it to hook up my thunderbolt3 equipped laptop to my tv and it delivers the promised 4k 120hz RGB 10Bit as promised. Very happy with the product, would buy again!However, there are some small hitches that I can't tell if they are a result of the adapter, hdmi cable, or just the overall setup. First, when switching Windows to HDR the connection between the tv and laptop is lost so reseating the adapter is necessary for it to continue working again. Sometimes have to reseat the cable if I disable the tv in windows and try to come back to it later. Lastly, the usb-c port on the adapter is a little jank. Most cables I've come across have a solid click when fully seated into the port that lets you know its in, this one doesn't have any sort of feel to it. While it doesn't seem to affect the connection, it doesn't necessarily inspire confidence either.EDIT: It just seems to not like changes to the display stats. Changing resolution, turning on hdr, disabling display in windows etc. These can cause the adapter to not be detected anymore. With reseating and getting the settings to stick, they are rock steady.

If your screen can support 4k 120hz HDR then this adapter does it all. I bought it for my LG CX but sadly gysnc isn't working with it as it comes across as a display port due to the compression algorithm in Nvidia control panel so the lg cx isn't showing up as connected via hmdi which seems bass ackwards from usual gysnc but gysnc on TV is basically VRR support. It isn't a deal breaker as I'll take the 4k120 via hdmi with HDR with zero flickering etc. Full support for 12bit HDR with full spectrum color and extended gamut at the TV's native resolution and refresh rate. Since 4k TV's are technically 4096x2160 you'll need to change from aspect ratio to full screen in the picture options in Nvidia control panel to remove the two black bars that appear at 3840. If if fills the screen a little too much you can resize the desktop or just set it to 4096x2160. Resizing is the most compatible option if you have a game or TV program where the HUD or crawl are obstructed by the overscan. This is another home run from cable matters