Had this discussion on another forum.
a heavily overclocked i7 3960X with 2 overclocked 7970 will chew approx 680w at very hard loads, so 2 7950 and the rest of said system should be able to be fed fine off a decent to good quality 750 without issue.
Just on wattage
7970=250w(is well within this range even when overclocking)
CPU=130watt as long as you dont overclock to high heaven
system=60watt or so
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690watt with very heavy load/overclock which simple numbers is approx
57amps off of 12v and I believe it would not be that high to be honest.
So, you should be A ok :)
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