Although I do not have a 300 Watt power supply, I figure that someone might find this useful. Silenx 400 Watt active PFC (I know, a hated brand, but I bought it before I read about the brand here, and I must say, it is very quiet) Core 2 Duo 6600 Asus 5PB Deluxe 7900 GTX 2 GB Crucial Ballistix memor...

Thank you for the super fast reply, makes me feal a lot better about keeping the old powersupply.

I am upgrading my computer to: Core 2 Duo 6600 Asus P5B Deluxe 2 Gig DDR2 Mem 7900 gtx 1 hard drive, 2 optical drives all in a p180 case I have read the forums, and I know that my current, quiet, 400 Watt power supply will be enough to power it in terms of Watts, however I am wondering about the 12V...