Custom Resolution Utility (CRU)

[ToastyX]

(02-13-2014 06:43 PM)jobby Wrote:  I found out that my monitor goes "out of range" at 74Hz, so I suppose that's its limit. At 73Hz it's fine, though, with no skipped frames.

I tried these two settings:

"Manual" (default) on the left and "Automatic - LCD standard" on the right.

The manual setting works fine, but with the LCD standard I get artifacts, kinda similar to the "snow" on analog TVs, mostly around edges

I've seen snow like that with certain monitors when the monitor can't handle the refresh rate or the timing parameters. Have you tried the "LCD reduced" timing option? It's meant to help in cases like this. Even if 75 Hz doesn't work, sometimes 76-77 Hz will work.

The settings on the left are just the standard timing parameters for 1920x1080 @ 60 Hz. With one particular monitor, I found setting the vertical total to 1100 allowed it to work at 83 Hz with DisplayPort.

The timing parameters don't affect the image with LCD monitors, but they can affect positioning with CRT monitors. Just use whatever works. The only issue is AMD video cards won't reduce the memory clock when idle if the vertical total is below standard, but I don't know if that applies to older cards with GDDR3 memory. Horizontal values usually work with multiples of 8, so you don't need to test every possibility.