I have two hooked up. Four plugs in one and three in another with the bottom one plugged into the top one, so it could very well be that. I plugged my PS2 back in when I got Persona 4 back on September 19th and I started having these problems about a week after Dishonored came out which was about the 16th.
I unplugged my PS2 and my External Hard Drive and I was starting to think that solved the problem but it just restarted again while I was playing ACIII.
Try some of the GPU benchmarking tools out there and see what happens then.
Before the crash any artefacts or screen tearing?
Also are you overclocking?
As for PSU if you have a spare PSU try that and see what happens, if it crashes with the PSU then that rules out that as a problem. It then could be a driver issue, GPU issue or system issue (as in Windows system files).
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The bugcheck code is 0x0 which is technically "NO ERROR" meaning that the memory dummp isn't occurring. They keyword value "0x8000000000000002" seems to point to a driver issue on other users' machines. You'll have to check your hardware for new drivers.
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My friend checked out the minidump and turned my processor speed down. it was going at 4.2 gigahertz. When that happened all my games were glitching so I restarted my computer.
After that I tried playing Assassins Creed III and my computer froze while I was playing the game so I had to shut it off. My computer has been running great ever since I turned it back on. Been playing Hitman: Absolution and Assassins Creed 3 religiously with no random restarts.
I just got done playing Assassins Creed 3 for 8 hours and nothing bad happened. The problem seems to be fixed, hopefully.
Update: I had a friend of mine check on my computer and he seemed to fix the problem and it worked well for about a month. Just yesterday the problem started back up again when I was playing Dragon Age: Origins and The Sims 3. I seem to keep getting different error messages. Here are the ones I found by looking in the system event logs.