The IRQL bluescreen error is a driver issue. Basically a command that was supposed to be sent to one piece of hardware, was sent to the wrong one, due to the driver telling it to do so. I know SoundBlaster Live! cards had this problem with one of their drivers a while back, but it honestly could be any device. I would suspect the sound, or video driver to be the most suspicious, since they are the only ones that really affect your machine at the run-level low enough to cause this sort of error. Upgrade those 2 drivers and see how it does.
Your suspicion of the processor is valid as well, since if a logic gate fails to write, all the data it outputs afterwards is garbage, which could easily cause the same error. Try running a window fan blowing into the case while you play a game to see if you at least get a longer play time, it will help troubleshoot if it is heat-related (because as mentioned, 54c is actually pretty hot after a reboot). If you are savvy enough, you could also go into the bios and raise the Voltage Core in the processor BY ONLY ONE TICK (if your BIOS has any overclocking). This will help the processor in cases of voltage loss, but makes it run hotter than it normally would, so do this with caution.
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