Custom Resolution Utility (CRU)

[Razkain]

Once a new resolution with higher hz has been created with cru, do I have to set "nvidia color settings" and "output dynamic range" to maximum in the nvidia control panel? Because it seems to me that after activating the new resolution the color is already at maximum even if in the nvidia control panel I leave it on "default color settings".

[Evader]

Hello hello!

I am sporting a Vizio P65-C1 and have been trying to follow this old guide from a few years back: https://www.reddit.com/r/VizioTV/comment...5_4k_60hz/

Another instance of it has been posted to https://www.reddit.com/r/nvidia/comments...pc_gaming/ by the same person.

Following the guide hasn't been difficult, but once I am done adding the 3840x2160p60 rez/refresh back in, the Pixel clock is inevitably far greater than the max 370 the display can handle.

The key line in the guide I see is: "SMPTE 4k at 60hz 422 8bit is 396mhz pixel clock > 370mhz max on HDMI 5. But VESA (aka PC) 4k at 60hz 422 is 356mhz pixel clock."

However, no matter what I pick on the Detailed resolution screen drop down, the pixel clock never drops below the 500s. I assume the guide writer was using a much older version of CRU, as he refers to the currently defunct LCD REDUCED option; however both 'replacements' per the patch notes do not seem to fill the niche he is specifying is possible here.

Was there some magical set of numbers here that get 3840x2160x60 to that 356 clock rate at 4:2:2? I have yet to even get any 4k60 to show up in NVCP, let alone try to pick a chroma for it.
I wish that guy would have exported his settings and shared it . . .

[ToastyX]

(03-13-2022 06:39 PM)Evader Wrote:  I am sporting a Vizio P65-C1 and have been trying to follow this old guide from a few years back: https://www.reddit.com/r/VizioTV/comment...5_4k_60hz/

Another instance of it has been posted to https://www.reddit.com/r/nvidia/comments...pc_gaming/ by the same person.

Following the guide hasn't been difficult, but once I am done adding the 3840x2160p60 rez/refresh back in, the Pixel clock is inevitably far greater than the max 370 the display can handle.

The key line in the guide I see is: "SMPTE 4k at 60hz 422 8bit is 396mhz pixel clock > 370mhz max on HDMI 5. But VESA (aka PC) 4k at 60hz 422 is 356mhz pixel clock."

However, no matter what I pick on the Detailed resolution screen drop down, the pixel clock never drops below the 500s. I assume the guide writer was using a much older version of CRU, as he refers to the currently defunct LCD REDUCED option; however both 'replacements' per the patch notes do not seem to fill the niche he is specifying is possible here.

Was there some magical set of numbers here that get 3840x2160x60 to that 356 clock rate at 4:2:2? I have yet to even get any 4k60 to show up in NVCP, let alone try to pick a chroma for it.
I wish that guy would have exported his settings and shared it . . .

CRU has always shown the pixel clock rate as pixels per second, but 396/370/356 refers to the equivalent bandwidth when taking into account the reduced chroma, which is 2/3 * the pixels per second for 4:2:2, so what they really mean is 594/555/534 MHz. For 3840x2160 @ 60 Hz specifically, "Automatic (PC)" is equivalent to the old "LCD reduced" option, which gives you 533.28 MHz (355.52 MHz equivalent).

3840x2160 @ 60 Hz should be available with YCbCr 4:2:0 without changing anything if you're using HDMI port 5 with UHD color enabled. If not, your GPU might be too old.

[ToastyX]

(03-13-2022 12:25 PM)Razkain Wrote:  Once a new resolution with higher hz has been created with cru, do I have to set "nvidia color settings" and "output dynamic range" to maximum in the nvidia control panel? Because it seems to me that after activating the new resolution the color is already at maximum even if in the nvidia control panel I leave it on "default color settings".

If the defaults are fine, then you don't need to change it, but the settings would also affect the other resolutions, so it depends if you want to change the settings for the other resolutions as well.

[Razkain]

(03-13-2022 08:34 PM)ToastyX Wrote:  

(03-13-2022 12:25 PM)Razkain Wrote:  Once a new resolution with higher hz has been created with cru, do I have to set "nvidia color settings" and "output dynamic range" to maximum in the nvidia control panel? Because it seems to me that after activating the new resolution the color is already at maximum even if in the nvidia control panel I leave it on "default color settings".

If the defaults are fine, then you don't need to change it, but the settings would also affect the other resolutions, so it depends if you want to change the settings for the other resolutions as well.

ToastyX, thanks for the answers and availability.

[jgp1211]

[size=medium]I have the version 1.5.1
Every time I create a resolution under 1280x1080 (e.g. 1156x1080) it black screens me and says input not support. I have not checked if a height under 1080 works with a width under 1280.
I have a 144hz monitor (can over clock to 150hz but don't because it sometimes black screens me when using CRU)
GPU: Nvidia 1070
CPU: i7 7700

Another question can I use a resolution with Native (PC) timing without it changing the Color Format from RGB

[Razkain]

I set a higher refresh with "exact reduced", because with "native" and "exact" I had unsupported frequency. With "reduced", is there any downside to the other options, like the video card is slower or the monitor is slower? Or there is deterioration in the graphics? Because it seems to go perfectly and quickly. Thanks for any reply.

[ToastyX]

(03-15-2022 10:14 AM)Razkain Wrote:  I set a higher refresh with "exact reduced", because with "native" and "exact" I had unsupported frequency. With "reduced", is there any downside to the other options, like the video card is slower or the monitor is slower? Or there is deterioration in the graphics? Because it seems to go perfectly and quickly. Thanks for any reply.

The only disadvantage is the video card might not clock down when idle depending on how low the vertical blanking is. The timing parameters don't affect the image quality. Monitors refresh from top to bottom, and the refresh cycle always takes 1000/Hz milliseconds. Technically a smaller vertical blanking period would mean the visible part of the refresh takes slightly longer to reach the bottom of the screen, but we're talking less than a millisecond difference.

[ToastyX]

(03-14-2022 10:11 PM)jgp1211 Wrote:  Every time I create a resolution under 1280x1080 (e.g. 1156x1080) it black screens me and says input not support. I have not checked if a height under 1080 works with a width under 1280.

Then your monitor doesn't support the resolution. Use GPU scaling.

(03-14-2022 10:11 PM)jgp1211 Wrote:  Another question can I use a resolution with Native (PC) timing without it changing the Color Format from RGB

That's up to the video card, but PC resolutions are normally RGB.

[JasonMT]

Does that LG CX 48 Gbps EDID hack mean that the CX actually supports 48 Gbps? Is there any way to confirm?

Also, is it sufficient just to change the Maximum FRL rate to 48 Gbps under HDMI 2.1 Support, or do we need to do something else?