Custom Resolution Utility (CRU)

[ToastyX]

(03-21-2020 04:49 AM)qqq Wrote:  hello ToastyX ，I use AMD RX5700 and find a very tricky problem when I connect two monitors (2560*1440@60Hz HDMI,3840*2160@60Hz DP).The memory(VRAM) clock will stuck at full speed(1750MHz) thus temperature will increase a lot when idle.This is really annoying.Many people also suffer from this problem for a long time with other AMD card when use 144Hz or more than one monitors.AMD official said they won't fix this in drivers because they don't think it is a problem.
I find the note of CRU(picture below) may solve this problem but I don't know how to do specifically.Could you give me some help?All I find now is the momery clock will auto reduce when I just connect one of them,or set them both 1920*1080@60Hz.
sorry for my poor English,thanks bro.

That's normal when using multiple monitors with different resolutions. The memory clock can only change during the blanking period to avoid screen flickering, but if you have two monitors with different resolutions, the blanking periods won't be synchronized, so there's no way to change the memory clock without at least one screen flickering.

The note about vertical blanking/total is a separate issue. If the vertical blanking/total is too low, there won't be enough time to change the memory clock without screen flickering.