Custom Resolution Utility (CRU)

[falkentyne]

Glad it's working.

There were problems with older AMD drivers where accelerated video playback would either stop or lag horribly if the pixel clock patcher were used. I believe this problem started just after the original beta releases of the 290x drivers (the first several initial releases were fine). Then some later versions were just completely borked (video playback would lag or just freeze if above 720p, unless you turned off hardware acceleration). It's been fixed for awhile now (I think all drivers after August 2014 fixed this), though; it was an annoying problem while it existed.

I compared playback over DP (without patcher) with DVI (with patcher) on the newer amd drivers, and no differences anymore.

Also the main point to using the VT tweak is not to get a brighter picture; that's rather a side effect due to the VT tweak changing the persistence values to the 60hz values (the higher the persistence in milliseconds, the brighter the image. Quick example: WITHOUT VT tweaks active: The default persistence per point of "Strobe duty" at 60hz is 0.167 ms per point. The default persistence per point of strobe duty at 100hz is 0.1ms per point (.1ms is lower than 0.167ms, so the screen will be dimmer with 0.1 ms than 0.167 ms). Using a VT tweak forces the refresh rate (No one knows why, however) to use the 60hz persistence values; thus you get a brighter screen).

The main point of the VT tweaks is to lower the amount of strobe crosstalk usually present around the bottom of the screen (this is because the Benq blur reduction does not use accelerated scanout). I prefer using a vertical total of 1500, which, at 100hz refresh rate, makes the strobe crosstalk very similar to Lightboost with accelerated scanout (VT tweak and Lightboost accelerated scanout do basically the same thing, although in different ways; you can tell by noticing a faint (this varies from monitor sample to monitor sample, even the two exact same monitors may vary!) horizontal scanlines pattern on the screen when in lightboost mode and you may see the same pattern in benq blur reduction mode with a 1500 VT tweak).