Best and cheapest psu for SLI n CF?

Without knowing what cards you intend to run how can you pick a PSU? I prefer to run mid range cards in SLi so I use a PSU that can can give me the 300-350w that I'll need for those cards whilst still having enough in hand to run the rest of the PC.
 

MJoob

Honorable
Jun 21, 2012
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10,540
Oh right i forgot to mention for the beginning i want to go for 7770 and then later another one... cuz im on a budget.