Custom Resolution Utility (CRU)

[ToastyX]

(10-04-2017 02:03 PM)WildWayz Wrote:  My TV is a Samsung UE48JU6400 48" 4K TV.

Prior to buying the GeForce 1080Ti that I currently have, I had a GeForce 1070. With the 1070, it detected and allowed me to use 2560x1440 60hz setting in Windows 10. No programs or custom profiles needed.

When I upgraded to the 1080Ti, I removed the Nvidia Drivers and reinstalled (also reformatted twice since then) - but I cannot for the life of me get 2560x1440 at 60Hz as it only allows me to select up to 30Hz.

The 'out of the box' resolutions it USED to allow for 60Hz was:
3840x2160@60Hz
2560x1440@60Hz
1920x1080@60Hz

Since changing graphics card it only allows
3840x2160@60Hz
1920x1080@60Hz

I've tried creating a custom profile in Nvidia's control panel, but the screen remains blank UNLESS I drop the desktop resolution to 1920x1080p@60Hz THEN add a custom profile for 2560x1440 @ 60Hz which works... but anything that changes the screen to 4K will blank screen it when it goes back to 1440p, if that makes sense.

Now, I know you'll say "Your TV doesn't support it then"... but it was working on the 1070! LOL

If I use CRU, do I just create a Detailed resolution like this, set it to Standard?

This is a little complicated to explain. CRU shows what the monitor defines. Keep in mind the graphics driver automatically adds some common resolutions as GPU-scaled resolutions if the monitor doesn't define them. If CRU didn't list 2560x1440 anywhere by default, then it was a GPU-scaled resolution. If you add 2560x1440 using CRU, it will be sent to the TV, and the TV might not support 2560x1440 directly. If you enable GPU scaling, it will be scaled to the first detailed resolution, but there's another problem. Your screen shot doesn't show HDMI 2.0 support, and 3840x2160 @ 60 Hz requires HDMI 2.0 unless it's added as a YCbCr 4:2:0 TV resolution in the extension block. If it's defined as a YCbCr 4:2:0 resolution, the GPU won't scale to a YCbCr 4:2:0 resolution, so there's no way to scale 2560x1440 @ 60 Hz. If it worked before, then there must be some setting in your TV that lets you enable or disable HDMI 2.0 support, or maybe you changed HDMI ports on the TV and different ports behave differently or have different settings. I can't find any information if that particular model actually supports HDMI 2.0, and if it does, if it needs to be enabled like on some TVs. The setting might be called UHD color or something like that.