Unable to achieve 4K at 120Hz on the Sony A90K using the 7900XTX and certified 8K (4K 120Hz) cable.
Unable to achieve 4K at 120Hz on the Sony A90K using the 7900XTX and certified 8K (4K 120Hz) cable.
Hello! TV model: Sony A90K (OLED display). Hardware: AMD RX 7900XTX GPU, 10700K processor. As mentioned, the device doesn’t support 4K at 120Hz—it caps at 4K@60Hz or 1080p@120Hz. This suggests a possible Handshake issue between the TV and the graphics card. I’ve tried various settings without success. HDR functionality is also disabled, even when using HDR mode. When using HDMI 3 and 4 in enhanced mode on the TV, the connection remains stable. According to MonInfo, the maximum TMDS clock speed listed is 300 MHz, which aligns with HDMI 2.0 specifications, not the newer 2.1 standards. The cable I’m using is a new 8K cable from HAMA and it’s certified for those speeds. I’ve reinstalled the drivers (latest AMD version) and updated the TV via EDID to attempt a 4K@120Hz display. Changing ports on both the TV and GPU helped, but pixel format and color depth shifted between HDMI 3 and 4, and the GPU handled two HDMI connections. I’ve adjusted AMD settings, scalers, Super Resolution, etc., but nothing resolved it. Assistance would be really appreciated. At this stage, I’m considering the cable might be the issue, even though it’s certified and tested. There’s a QR code on the box linking to the official HDMI site, confirming this model has been verified for 8K performance.
Likely these issues stem from generic parts. Even premium cables often fall short in high-end specs. Just swap to a different cable—some claim it's HDMI 2.1, but most are just 2.0. I've experienced this before; I ended up with a cheap Duracell 2.1 cable from the bargain bin that performed great after my more expensive UGreen and Sony models struggled with 4K at full speed. The bargain price made it worth it.
It seems to be the sole issue to blame here. I didn’t want to admit it, but I bought the cable on Friday and tossed away the receipt, thinking everything would be okay because it’s a certified product. Probably not right. The bigger concern is that I can’t find any cable that’s long enough—specifically, three meters.
I wouldn't jump to the cable immediately. I experienced similar issues before, but my symptoms differed. Even if the cable can't support the higher data rate, you should still expect 4k120. The main concern arises when you choose an inadequate cable, leading to a blank screen or frequent picture drops. If you don’t see 4k120 at all, it points to another system issue. Possible causes include GPU drivers or TV settings. The cables I used were certified, had the barcode, and directed me to the correct product. They were brands I hadn't encountered, making Hama a noticeable improvement.
It turns out I'm more confused than I thought, but I'll still point the finger at Sony's design for these TVs. I own an A9 Master Series model that only works with HDMI 2.1 and eARC, while the A90K supports 4K120Hz. It took me some time to compare them because they look identical from the front. In the end, I guessed I had the A90 instead of the A9.