Custom Resolution Utility (CRU)

[ToastyX]

(02-13-2023 11:47 PM)Imgquest Wrote:  Hi guys. First of all I want to thank you for taking your time to read this. I’ll try to be concise.

Since this is my first time with dual monitors and a semi high end PC (Samsung TV UN40EH5000G - Gigabyte G27F2 – RX570 8gb) I’ve never had this problem before. A 60hz FHD TV without Freesync through HDMI (2.0 I guess, It came with the G27F2 monitor) and a 165hz IPS FHD HDR ready monitor with Freesync through a Displayport 1.4

After setting it all up I find that my GPU’s core clock and memory are higher than usual while idle in desktop (usually 300 mhz – 300mhz. After dual setup, core 588mhz – mem maxed to 1750). Worried of course I started searching and reading until I found this place. Thanks for all the information provided, definitely a whole world.

Even though I learnt a lot of new things I’m still new to this. I tried CRU settings for Automatic PC, CVT RB and manually changing vertical blanking and I was still unable to stabilize GPU clocks. Also when I tried CVT RB some spaces of the screen remained pure white.

Having already disconnected the TV I was still trying to solve this Timing problem with the G27F 2. Finally I found a solution by creating a custom resolution with amd’s adrenalin. Lowering refresh rates to 142 and selecting CVTRB but I’d prefer to use CRU.

Nevertheless the whole problem came back when I connected the TV back. I also deleted the custom resolution for the G27F2 until I can find a solution for both screens.

I’m really worried because this means having the GPU’s mem all day maxed and with higher temperatures since I use this station for work and leisure. Not to even mention electricity costs and the obstacle to enjoy without worries my first high end monitor ever that was worth a lot for me.

This is completely normal and not really avoidable if you have two monitors with different refresh rates. When the memory clock changes, the memory has to be retrained, which will distort the screen contents, so this is normally done during the vertical blanking period between refreshes to avoid making the distortion visible. When you have two monitors with different refresh rates, the blanking periods won't be synchronized, so there's no way to change the memory clock without seeing distortion on one of the screens. The issue with single monitors is different and refers to certain monitors not giving enough vertical blanking time to retrain the memory at higher refresh rates, in which case you can just increase the vertical blanking to resolve that.