Originally Posted by Falkentyne
Guys, I may have a bug here.
Are any of you running 120 hz or 144 hz displays (especially 144 hz) with these beta drivers (not CRT); any 120hz gaming display.
If you are, please do the following:
1. Set your monitor to the highest refresh rate. Verify in GPU-Z that the 2D idle speed is now at 500 instead of 300. If its at 300/150 then nothing will happen to you from this test.
If it's at 500, check the VDDC gpu voltage. Is it at high 2d (0.949v is supposed to be the voltage for 500 mhz) or at full 3D voltage (1.050v-1.25v?).
2. Enable overdrive.and change the RAM speed to anything above the default speed (make sure its a known stable value). Did the RAM speed go up in WINDOWS to 1600--check the GPU-Z Sensors~ (my example), and the GPU go to 3D voltage even though the core is 500?
3. Check GPU-Z in windows. Is your RAM speed set to the overdrive speed (e.g. 1600+ on a 7970) instead of the default 3D speed (e.g. 1500 default; lower for lower cards?)
4. Can you please go to youtube and run a flash video with hardware acceleration enabled and see if your display gets massively corrupted?
This causes my screen to become scrambled either instantly, or after the video stops running (corruption looks like a serious ram issue). If I'm lucky and alt f4'ing internet explorer restores the screen (sometimes it doesn't, forcing a reboot), GPU-Z shows the RAM speed during the flash playback *downclocked* back to default (1500 mhz), while remaining 1600 mhz (my overdrive setting) in everything else, including idle at the desktop or launchig games. I think that RAM downclock to 1500 or the RAM being forced to 3D speeds on the desktop is causing corruption when flash forces the RAM back to 1500.
This seems to be a driver problem. If hardware acceleration is disabled in flash, the RAM stays at 1600.
Running something as light as UT2004 windowed with 3% GPU usage either shows 500/1600 or 1000/1600
The bug is rather obvious:
Either the GPU is being forced into 3D voltage and the RAM running at 3D speeds in wnidows, with the GPU running in 2d speeds, or flash downclocking the RAM to default speeds if overdrive is enabled, causing corruption. This doesn't happen with CRTs or normal 60/70/75 hz LCD monitors.
No problems at all if overdrive is disabled. 7970 using 500/1500 in windows with 0.949v with overdrive disabled, 500/1600 with 1.170v in windows 2d with overdrive enabled.