I have 2 of those Powercolor cards in crossfire. I can tell you that one will run a single 25 inch monitor at good speeds, 80 to 100 fps with everything on high except that SSAO is off, provided the rest of the system is up to par. It also runs substantially cooler than the reference design card, despite the fact that it has a decent factory overclock.
I got a second card to run triple monitors better, and it does pretty well, though not what I'd hoped. Also, in crossfire the airflow to the top card is largely blocked by the bottom card, so the top card runs on the warm side now...
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