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Making the assumption of a standard PC with standard parts and yes, I know there are PSU Calculators, but i'm talking brand names that are good and reliable.

Cheapest possible please!

I want to run say 2 ATI Raedon 5770's in crossfire for a system I want to offer for sale. I've heard bad things about SHAW, so want to avoid them :P

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2 Answers 2

up vote 1 down vote accepted

if you're running crossfire on a 57xx series, the GPU's are quite low power (in comparison to 48xx series and nvidia GPU's)

so corsair's value range should be fine (VX series if they do them in the required power range), antec, Enermax and OCZ all make decent PSU's too

this article page has a power consumption chart for ati crossfire cards.

as has been said, go for an 80+ certified and you should be fine (most efficient at 80% of maximum load)

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... Lucky ***! (Wish I had those cards... and time for gaming!)

Anyway, jealousy aside, According to the specification page:

450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)

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Well, lucky is the person who buys the system, so, whats a good brand for a power supply that provides that power? (As, pretty much all of them do) –  SevenT2 Nov 25 '09 at 6:45
    
I just had a client who bought an expensive 1000w PSU and it failed after 9 months... There is no good one, you just sometimes get lucky! If going for over 550w, I would personally recommend getting a 80%+certified one as it cuts down on power costs, apart from that, just make sure it has a good warranty. –  William Hilsum Nov 25 '09 at 6:46
    
Thanks for the information :) it will definately help when someone can actually afford that systemL its only $2000... Hehe.. Only.... :S –  SevenT2 Nov 26 '09 at 6:16

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