How big psu to buy?

catatafish

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+1.

This would probably also work, and its modular.
http://www.google.com/products/catalog?q=tx750m&rls=com.microsoft:en-us&oe=UTF-8&startIndex=&startPage=1&safe=active&um=1&ie=UTF-8&tbm=shop&cid=6869072427231322831&sa=X&ei=08CRT6DkJsXN6QGwmOm4BA&ved=0CDwQ8wIwAg#
 

catatafish

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Coolermaster, not a really loved brand for reliability and performance.

The GS800, sure.
The TX650, that's what I'm using and it only has 2 PCIe connections, you need 4.
 

andrew_rs

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Of those listed on the site I'd be inclined to recommend:

ANTEC HCG 750W, the OCZ 750W ZT, the CORSAIR GS 800W , and the CORSAIR TX V2 750W

My personal preference would be to go with the Antec, however the OCZ and Corsairs would be good as well.
 

catatafish

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You've been given lots of solid choices, you're just going to have to pick one :). Pick the one that you think looks nifty....you won't go wrong with any of the above on the last few posts.