*quite un-helpfully* eh, going from my MSI TF2 6950 to my first TF3 7950 worked like a charm. Didn't even uninstall the
device from the hardware manager. just powered down, swapped cards and booted back up. After a couple of reboots, the thing was working beautifully. It apparently even has nice OC headroom and hit 1200/1600 with under 7970GE stock voltage -- and all this from an open-box card which I was dubious of...
And thus things worked fine for a week...
Tonight however, *ominous thunder and lightning in the background* I received my second TF3 7950...
Since then everything has been going askew... for one thing, this brand-new-in-box card evidently doesn't clock anywhere as well as the first -- the GPU is weak, but it's the memory which looks to be a real shame... For another, software that I'm accustomed to counting on doesn't accept the new card like it could. (WTF GPU-Z; how hard is it to log 2 cards' sensor readings, once you're already doing all the work for a single?) Then there's the fact that Multiple-GPU "micro"-stutter looks to be a blatant reality -- I mean, what's with a benchmark yielding higher FPS numbers but visibly skipping through more of the animation than with the single card?... And then there's the fact that I've finally exceeded my UPS' power limit and that this was apparently another factor in causing instability when crossfiring. Not that the UPS was triggering its over-current alarm when this happened, oh no, I only realized the problem on a rare occasion when the system didn't lock up but the UPS finally gave out an alarm signal. But sure enough -- and whether the APC "smart"-UPS was clever enough to notice it or not -- that was causing my lock-ups.
Was there anything else? oh, I don't quite remember, but in any case this seems like more than enough thread derailment for someone who was good enough to avoid derailing another 20+ page thread....
@ OP & TLDR Try disabling/uninstalling all 3rd party OC/Monitoring software. Though I can't remember exactly which combination was evidently causing me grief in the last week, I'm pretty certain that such a thing did happen.
edit: ... and upon reading the thread more carefully, I am now considering a good, deep driver sweep. ... further, I assume that what I'm feeling right now is akin to what people must be experiencing prior to their decision that it really is time to find out what a cleansing enema is all about...
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