yeshuas wrote:that power supply is the bare minimum for what you want, not having enough power is hard on a graphics card, I have a similar graphics card in my machine and I am using a 750w power supply, in my opinion you are asking for trouble.
I'd agree with that one being borderline.
A GeForce GTX 260 requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 38 Amps available on the 12 volts rails.
That is a good PSU but the margins are so close that I wouldn't risk my machine wishing that the power supply won't die today.
With all due respect to yeshuas, I think a 750W would be overkill but will last forever like my Corsair TX750W but go for a PSU that easily clears the 38A minimum requirement. A 600W quality unit should suffice.(If you will never go SLI with a pair of 260's)
It's refreshing to see a proactive thread about PSUs as most folks never think how power thirsty these cards can be until the 'uh-oh moment'.
I can't recommend any XFX products as I'm an eVGA man.
Everything that irritates us about others can lead us to an understanding of ourselves. -- Carl Jung
eVGA X58 tri-SLI, i7 930 @ 3.8GHz., Corsair 6GB Dominator, Inno3D GTX470, eVGA260
ASUS P8P67 Pro, i7 2600K @4.60 GHz, 8GB RAM, eVGA GTX 460