Custom Resolution Utility (CRU)

[albertfu]

(02-24-2016 03:29 PM)ToastyX Wrote:  

(02-24-2016 12:31 PM)albertfu Wrote:  By using DP port of a 290X tri-crossfire configuration, "Pixel Clock Patcher" shouldn't be needed right ?

The patch does nothing for DisplayPort, but pixel clock limitations can still exist.

(02-24-2016 12:31 PM)albertfu Wrote:  What is the reason of CRU's limitation upon refresh rate ?
(4K in LCD standard mode gives a 73Hz maxi refresh rate, anything above is forbidden in red color)

That's an EDID limitation. It's not possible to define a pixel clock greater than 655.35 MHz. Higher pixel clocks would require the DisplayID standard, which isn't widely used yet.

(02-24-2016 12:31 PM)albertfu Wrote:  Why refresh rate that can be chosen in Windows is lower than in CRU ?
(4K in LCD standard mode gives a 67Hz maxi refresh rate, anything above can't be displayed in scroll down list)

That's a driver limitation. I'm not sure what limit you're running into, but it looks like the driver is not allowing a horizontal scan rate greater than 150 kHz, which I haven't seen before.

(02-24-2016 12:31 PM)albertfu Wrote:  BTW, how does OCing of monitor impact its lifespan ? I'd like to hear from a forum dedicated to that.

That depends on the hardware. There's no way to know for sure, but something like 75 Hz shouldn't be an issue.

Thanks for your prompt reply ! That explains a lot.

For limitation of horizontal scan rate (150KHz), it came to my mind too, I noticed it while switching between LCD standard and LCD reduced modes. Both top at approximately 150KHz horizontal scan rate at 4K.

But later I tried 3200*1800@85Hz and 3520*1980@79Hz and succeeded, they both exceed 150KHz horizontal scan rate (160KHz and 162.2KHz respectively), so it seems that the limitation is not the same across resolutions, quite weird...



Tried Pixel Clock Patcher and no avail, as expected (it is over DP port).

Another question : if we only take LCD panel's capability into consideration, refresh rate limitation should remain the same for different resolutions ?