(10-01-2015 06:29 AM)Freasy Wrote: [ -> ]Hello guys,
first of all i have to thank all of you guys, you realy helped me setting up my monitor for perfect play experience!
My question is, what is the maximum pixel clock my monitor can handle and do i have to patch it.
I have a ATI R9 280X and a BenQ XL 2430T connected over displayport. When i set up my resolution at 144hz, the monitor cant display it. At 120hz its fine. And i havent touched the vertical total value, i dont know what it realy does.
When i set up at 1440x1080 with 120hz and a vertical total at 1500 the pixel clock gets around 396mhz. I never tried that, because i am afraid of breaking my monitor.
Can you help me with this?
Regards
Freasy
You can't create a 1440x1080 144hz display scaled resolution.
If you need to use 1440x1080@144hz, use GPU scaling and it will use the 1920x1080 resolution.
Create a 1440x1080 60hz lcd standard resolution then use GPU scaling.
You also can't use vertical total tweaks at 144hz at all. 144hz requires "reduced vertical blank"; this is about vertical total of 1098. Going much higher will cause a black screen out of range. *EVERY* monitor is like this, except a few Korean monitors that CAN use normal timings at 144hz and possibly the upcoming 200hz monitors, but video cards will still need to support those.
Also if your pixel clock is 396 MHz, that's too high. The Mstar scaler will show image corruption because it's operating outside of parameters.
For 120hz: Vertical total 1500, and also for 100hz vertical 1500, use these timings.
1920x1080 @ 100 and 120hz:
Front porch: 48 pixels, 3 lines (you probably have this at 88,4).
Sync width: 32 pixels, 5 lines (you probably have this at 44, 5).
Horizontal total: 2080 (you probably have this at 2200).
vertical total 1500.
You can use this for 100hz and 120hz. You can even use it for 125hz!
The pixel clock should be 374.40 MHz at 120hz with these timings, and 312.00 MHz at 100hz.
If you want to use 1440x1080, and want to use a vertical total tweak, create a 1440x1080 60hz resolution in ToastyX CRU. Use LCD standard timings for it. Delete your 1440x1080@120hz or 100hz one you made. then enable GPU scaling in the drivers.
Then when you select 100, or 120hz at 1440x1080, it will use the 1920x1080 with VT tweak applied, downscaled to 1440x1080 on the videocard. If you want a 1:1 image with black bars, select 1:1 in the VIDEO CARD PANEL. Do not select it in the monitor! The monitor scaling options become distorted and act strange when using vertical total tweaks.
If you want 1440x1080@144hz, this will be gpu scaled from 1920x1080@144. remember 144hz can NOT use VT tweaks at all ! (default VT for 144hz=1098, LCD REDUCED TIMINGS).
The absolute maximum pixel clock the Mstar scaler can handle without severe image corruption is somewhere between 430-440 mhz.
The DVI limit is based on that and your dvi cable assuming the pixel clock patch is applied.
For displayport the absolute limit is 480 MHz for 6 bit and 360 MHz for 8 bit. But the scaler can't seem to do more than 440 MHz without corruption.
I was able to use the VT 1500 "trick" to create a 2560x1440 110 MHz custom display scaled resolution with a 440 MHz pixel clock. (reduced HT of 2656).