8800GTX power supply?

[simon11]

I bought a new computer a few months ago a Core 2 duo with one 8800GTX card. I asked for a power supply that would run two cards in SLi for future use. They put me in an Atrix 600T 720w which I questioned at the time but they said it would do the job o/k.

I have only one card installed but if my computer is on for any length of time and I play even a slow game like pool or Tiger woods golf. My computer keeps dropping back to the desktop with the message that there is not enough power to the card and that it has been slowed down to protect my computer. The twelve volt rail is only at 11.6 volts. Is this normal? Or is my power supply underated or faulty?





Thanks for any reply.



Simon.