System Freeze/Audio Stutter HD4850 *update* Multicolored Bar Crashes

Hey all,

This might not even be a video card issue, but I figured this was as good a place as any to post this.

My Specs:
Corsair 650 PSU
2 GB Patriot
e8400
P5Q-E mobo
4850 gpu

Vista Ultimate 32-bit


In every 3D application I've tried to run seems to lock the system up requiring a reboot.

If what I've been running has audio, the audio will continue to play stuttering the same 2 seconds or so over and over.

Its a hard lock, CAD won't work.

Initially, certain sections in the Witcher, would cause a crash, sections that, once identified, I was able to avoid to keep playing the game.

Then running 3Dmark06 would crash after a couple of minutes.

Now the latest crash happens in Crysis 1-5 minutes into the game.

Those are the only programs I've tried to use so far.

Memory is fine, memtest passed.
CPU is fine, but runs a little hot.
GPU is not overclocked at all.
PSU gives more than enough juice.

I've seen this problem happen to tons of people using my google-fu, but no solutions, and they might not even be having the same issue.

Using latest drivers for everything (already updated them all trying to solve the issue myself)

I've read that a voltage did in the 3v rail could be an issue, but the Corsair should be fine.

Prime95 has been run for 8 hours stable.

I've tried running tons of different videos and music and such at the same time, in an attempt to recreate a crash, but I'm at a loss. If Prime95 doesn't crash it, I just don't see how a game could unless it was the video card's fault.

Anyway, suggestions would be good. There are no artifacts to precede the crash.

Thanks.
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After doing a fresh cleaning/install of the drivers and getting rid of all the third party software stuff, using only the catalyst control center at stock speeds and forcing the fan to stay on at 80%, instead of locking up with a black screen, it now likes to crash with vertical multicolored bars.

Running Crysis in windowed mode so I could monitor CPU and GPU temps/fan speeds, both temps topped at 58 cpu/71 gpu and the game lasts about 30 mins to an hour before crashing occurs. There are only two other things I can think of to try before outright saying this card is a piece of ****. Perhaps the voltage is too low on the 3v rail (not likely considering the corsair psu), or maybe the RAM has errors which I will discover after running memtest tonight when I go to sleep.

I have also been using Furmark on the burn in setting to try to get the temps up on the card at a full load (did the renaming of the exe of course), but it still tops at about 85.