I have one of these
Antec.com - TruePower
and one of these
Inno3D Graphic Card - Nvidia Geforce 8800GTX Over Clock DirectX 10 Extreme HD PC Gaming
when i load up a game it seems to work however i have a continuous beep, and i think it is from the PSU
and there was no beep with the old grfx card
Inno3D Graphic Card Nvidia Geforce 8800 GTS 512Mb DirectX 10 Extreme HD Gaming
being the google tech i am i found references to the psu beeping when pushed over its limits, but i think this psu should support it, perhaps it is faulty but i would like to be sure or at least have someone confirm my suspicions before i go and pay for another one as seen here
Antec TruePower 2.0 True550 - Price Comparison - Buy at cheap prices