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Until 28nm comes along the HD6850 is about as good as it gets for single 6-pin powered cards. Personally I think the 6850 is a brilliant value for money you can pick these up for £111 each and pair these up in crossfire and putting aside the downsides to multiple GPU's for a moment you have a GTX580 beating package for £222.
5770's are LOUD.
Should I buy another 5770 and run in crossfire mode or step up and buy a single 6850.They are vapor x cards.