Microsoft sets up three 4K PC monitors for 1,492,992,000 pixels of gaming

[nnodley]

Pemalite said:

2x Geforce 680's should be more than enough for triple 1080P screens, provided your PSU can keep up. (The article was only running a 750w potentially no-name PSU on 3x Radeon 7970's and wondered why they ran into problems, not to mention the crap Antec 900 case.)

Essentially, just keep adding a Geforce 680 untill your performance is adequate.
But even at 5760x1080 you might be pleasently surprised how many games you can run at 60fps with a single Geforce 680.

Thanks for the info!  I'm pretty sure I have a 750w PSU.  That's should be enough or should I try and find one that's over 800w just to be on the safe side?