My video card is a gtx285 OC, that is a factory overclock though.
I have been having more frequent CDTs since the summer, since then I have been monitoring my temps and they never get past the low 80's.
Until recently I thought of no reason that the video card was the issue.
a) Other games run fine even when I tax the card more and run a lower framerates, the temps are the same on the high end for any game that pushes the card. None of the other games CTD, lock, or bluescreen. In fact I played all the way through the original Crysis on this same setup.
b) Most of the time I would get CTDs, occassionally a black screen with a lockup, and rarely a bluescreen in MWLL.
c) So for the hell of it I throttled the fan to 100% from its auto settings...3 days now without a single CTD, played countless MWLL games from beginning to end. Typically I would get 3 in a 1hr period. The GPU now runs in the low 70's.
In reality things still don't make sense, after all the mod taps in to the features already provided by the cryegine, so why didn't Crysis do the same? I would think that maybe MWLL is tying into a graphic element that wasn't heavliy used in Crysis. It would seem that whatever it might be it taxes the video card and/or the drivers more so than Crysis ever did.
Even if you don't think it's the video card, do what you can to make it run cooler and see if it helps.