How many watts dose 2 9800 gx2 need?

corsair 850
http://www.provantage.com/corsair-me...x~7CSM900N.htm
124.16(20.00 mail in rebate)

psu Cal
http://web.aanet.com.au/SnooP/psucalc.php

Don't know the budget yet. Depending on you do SLI for gaming or folding and OC the quad or not. Let's say you do SLI. The GX2 is a 197w GPU. With OCed quad and SLi scale, you need a psu that can do 570w on 12v at least. Get the a GPU such as Corsair 750tx for some headroom.

No budget and ill be using them for gaming

if theres no budget then grab dual 295's or tri 285's