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750W is more than enough for CrossFireX 7870
However, depending on your motherboard, the second HD 7870 may or may not work at full speed.
I will also note CrossFireX / SLi is not something that I would consider doing on a single monitor setup.
Not as much as you might expect. WoW benefits from CrossFireX / SLi, but not as well as games using modern game engine.
I'd expect about 70~80% increase (assuming 100% being equal to 2x the performance of single card).
Edited by Kalganized on 11/26/2012 11:18 PM PST
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