Custom Resolution Utility (CRU)

[ToastyX]

(06-24-2015 01:11 PM)fandangos Wrote:  Thank you, Toasty! It worked! Still.. nvidia drivers didn't allowed it to fully work.

3840x2160 @ 60hz became my native resolution, and I lost 4096.
2560x1440 @ 60hz were in the PC section resolution.

But since my TV doesn't support 2560x1440 when I select it, I get unsupported signal.

The good part is that GPU scalling option is available - it's not available in HDTVs according to Nvidia.

The bad part is that it's limited to 30hz only.

I've found a user stating this on a forum:
1) At 60 hz, the GPU will not allow scaling from 1080p->2160p because of limitations with NVIDIA's MST implementation.

I believe this might be the case here. Some limitation on Nvidia drivers.
Everything is set to 30hz when GPU scalling is on, even 640x480.

MST is DisplayPort. That wouldn't affect HDMI. Try setting "Preferred refresh rate" to "Highest available" under "Manage 3D settings" in the NVIDIA control panel. If that doesn't work, try changing the 3840x2160 @ 30 Hz entry to 60 Hz. That will get rid of 30 Hz at least. The problem is if the driver ignores that, it might try to scale to 2560x1440 instead. I don't know if there's a way to set 4:2:0 resolutions as native.