Since I have not found a way to test my power usage on my computer I thought I'd ask the question.
The system is:
Asus A8N-E Opteron 170 2x512 Kingston HyperX EVGA GeForce 7900 GT KO 2 x WD Raptor 36 gig h-drives SATA 1 x WD 200 gig h-drive SATA 2 x Optical drives 1 x 3" fan 2 x 120mm fans 1 x USB addon card (only 2-3 USB ports used at all times)
Powered by Enermax 535W power supply (model EG565P-VE FMA V2.0)
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I think its a safe bet that your PS rating is ok for what you have. Now as for the quality of that PS, im not sure.
Well several reviews say the quality of the power supply is good.