Imac crashes black screen

Imac Crashes leaving black screen, need to turn off and on again to remedy.... quite sporadic in any programme - can anyone help?

The fans may not be the cause of the problem but it's definitely related. Now I'm running the hardware monitor every time I play D3 and it always warns me that the CPU fans is spinning up shortly before the crash, which may then occur within seconds or at most 2-3 minutes when I stay in fullscreen. I can't remember experiencing a crash after I went back to windowed mode after the alarm, but I also haven't pushed it much. Also, the temperatures reported really don't look awful at all, nothing exceeds 80°C, there's no sudden surge.
Interestingly, the computer actually keeps running after the screen goes black (but D3 is definitely out), and only when I press cmd-alt-esc does the whole system go completely down (looping sound).
I've checked the logs and couldn't find anything really significant, then again I may not know what to look for. The only suspicious entries at more or less exactly the time of the crash (although I can't tell whether it's when D3 crashes, or the whole computer) are the following in kernel.log:
12-07-14 2:57:48.000 PM kernel: ** Device in slot: SLOT--1 **
12-07-14 2:57:48.000 PM kernel: ** GPU Debug Info Start **
12-07-14 2:57:48.000 PM kernel: 0x00006740
This is followed by 544 lines similar to the last one with various hex addresses over five seconds, although after line 436 only 0x00000000's are reported. The line just after that is at the time when I restart the computer and says
Jul 14 15:00:36 localhost kernel[0]: PMAP: PCID enabled
system.log doesn't report anything in this time frame, there's no crash report for D3 in CrashReporter... Is there anything else I could check?

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