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Mobility Radeon 4670 + External Monitor + Win7 (x64)
My problem in a nutshell is that when I use an external monitor, then sometimes Windows 7 Aero becomes very choppy, but other times it is smooth (independently of how many programs are running). This choppiness comes back periodically and I could not observe any correlation between the usage of the resources (cpu, gpu, memory, etc) and this phenomenon. It is very annoying, but it only pops up (or at least it is only observable) if I connect an external monitor. I have an ATI Mobility Radeon 4670 card with 1GB of GDDR3 memory, so it should be enough to handle Aero (especially since I have disabled some of the features, such as transparent glass).
I tried updating the BIOS, the video card driver (I even tried the unreleased beta driver), but this annoying thing always remained. My guess would be that it is a video card related issue, since if I disable PowerPlay, then it somehow decreases the lag, but it does not disappear. Strangely, another thing that decreases the choppiness of Aero is if I use the external monitor in portrait mode (instead of landscape mode).
What do you think, is it a Win7 issue, a driver issue or a hardware issue?
Last edited by bcsaji; 18 Feb 2010 at 03:29.