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Problem with random BSOD - new desktop
Turner
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The main hint to me is that it takes time (while consistently using the system) for it to cause the problem.
It could be something else, but the first thing I'd try to check is what the temperature of the system and CPU is once you've been playing for half an hour or so. Just don't touch the heat sink on the CPU directly, in case it is overheating... it can get hot enough to cook human flesh on if it's not hooked up right or the fan's not going fast enough. EDIT: If you have a sensor on the motherboard or otherwise that you can use to check temperature, this is your best bet. Run a game that works your system (like the ones you've been playing), and watch that temperature. Like I said, it could be something else... but I had the exact same problem on three systems over the past decade or so, and all of them turned out to be overheating.
EDIT 2: I just noticed you have the intel duo too. Are you using the heat sink that's packaged with the CPU? I think I mentioned it on a prior thread, but that stock heat sink/fan is horrible. The plastic push-knobs that are used to secure it don't convince me worth a damn that the thing is secure, and I've actually had one of these stock heat sinks literally FALL OFF of the CPU while it was running (resulting in the undertandable death of both the CPU due to overheating and my video card due to being the direct bearer of the heat sink's crash landing) because the pins are very difficult to get in properly, and even when they are in they're not terribly secure. After this incident happened, I switched to AMD... but the fact that you're using the intel (and thus possibly their questionable heat sink) makes me even more suspicious of the overheating possibility.
Again, if you just built it today its very likely that one of the fans just isnt plugged in.
Copying down the error code on the BSOD and the googling should tell you exactly what i believe.
edit: 550w psu. I'd check the PSU to make sure it's working right, and get one of the free apps out there that runs all your fans at full force when gaming, and see if that helps.
I was getting similar BSODs when I built my current system a few months ago. Fixing the timings fixed the BSODs.
And your GPU temp is fine.
5th test.
If one of your RAM modules is bad, Windows will often bluescreen as soon as it tries to use the bad Memory areas, which sometimes doesn't occur until you've been using the system for a while (especially in game systems with lots of high level memory, 2GB+).