Over the past couple months I've noticed that there's like a 20-30% chance that, when playing x264 video (doesn't matter what media player), it can cause hard locks. If I stop it, close the app while it's playing, (or sometimes after it's playing), or even when the video stops itself, a hard lock may occur. If I close the app you can see a short gap in between the aero animation, even if it doesn't lock.
Specs: Gigabyte EP43-DS3L/Intel C2Q Q8200/4GB of PC6400 G.Skill RAM/Asus Radeon HD 3650/Windows 7
Things I have done:
-Uninistalled ATI drivers, used driver sweeper in safe mode, and installed the generic Windows ATI driver. It does seem to cause less hard locks and performs better. Certain videos will now never lock up the system even though they did before, but some still do, but it's much less frequent even then. So I'd say the driver is much more stable.
-Uninstalled all misc. codecs from things like CCCP. Relying on nothing but the codecs Windows has by default.
-Monitored system temps while this is happening. Nothing is overheating or coming anywhere close.
-Used Memtest86+ and let it run through a couple passes with no errors. Also used Video Memory Stress Test which is like Memtest but for GPU memory. No errors.
I'm thinking it has to be my GPU. I can encode x264 with no problem and do other CPU/Memory intensive tasks. No lockups, ever.
Before deciding to use the Windows ATI driver, I did reinstall Cataylst. There was some weird overlay stuff happening. For example, when I dropped down the bookmarks menu in Firefox, everything behind it turned black, and/or the bookmarks upon being highlighted turned a different color. After using driver sweeper and reinstalling the generic driver, the problem went away. I don't even know if that was artifacting though, so much as it was a driver problem.
I am trying to figure out if this is a software or hardware problem. If it's a hardware problem I'm almost 100% certain it's the GPU, but I don't understand why as the temps are fine (it is fanless, but also just a Radeon HD 3650). If it's a software problem, I'm really clueless. Perhaps a video codec is corrupt and causing a memory leak? I don't know. I never do any gaming on my PC so this GPU is fine for what I do, so I'd hate to spend another $70-100 on a new one. I want to exhaust all my options before I buy more hardware. I'm a step away from backing everything up and reinstalling Windows which I'd hate to do.
Any help would be appreciated.