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Here's the list of PSUs certified for Crossfire 2900's (thus two PCI-E 8-pin connectors, or adapter included with PSU):
http://ati.amd.com/technology/crossf...dyourown2.html

From the list, I would recommend the following PSUs, and I added some PSUs with one connector that I recommend (obviously not on the Crossfire list
):

One connector:
  • Silverstone OP and DA series (OP is fixed wires, DA is modular. Otherwise identical)
  • http://www.newegg.com/Product/Produc...82E16817256022
  • I believe that you can get an adapter cable from Corsair with their PSUs. So, the Corsair 520W and 620W are also good options.
Two connectors:
 

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Quote:

Originally Posted by mth91 View Post
Athena Power 550w

http://www.newegg.com/Product/Produc...82E16817104122

apparently it's actually not sli-capable, but it will power an 8800 series very well because the +12v is at 28 Amps not less than the 26 amps required by the 8800 gts. Most sub 100 psu's are less than 26 amps at +12v
I challenge that comment. There are plenty, and much better, psus with >30A on the 12V rails that cost less than $100.

Number 1: SilverStone ST50EF-Plus 500W PS w/ active PFC and 80 Plus Efficiency $80.75 and 35A on the 12V rails.

Number 2: ENERMAX EG495AX-VE FMA ATX12V Ver 2.2 485W $79.00 and 32A on the 12V rails.

Number 3: FSP Group (Fortron Source) AX500-A, 2.0 version $86.99 and likely 30A or so (not sure though)

And there are more... this is just a sample
 

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Doesn't matter.

What matters is the quality of the components and the construction of the PSU. How many rails it has doesn't affect the quality.

Look for a good PSU: either of the Corsairs, the Silverstone OP and DA series, and several others are excellent PSUs.
 
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