I was looking at a PSU for 8800 GT sli and saw a little * about the GTX 260. The corsair 650TX psu is rated for SLI, but not approved for the GTX260 SLI, so I would get the 750TX for GTX280 SLI, and maybe something like a Real Power Pro 850w from Cooler Master if you were going to tri-SLI because from what I've seen 280's are power suckers.