I'm about to purchase an XFX 6600GT card. However, I'm a bit concerned with my 350W power supply. Will 350W be enough power to drive my system once the card is installed. Do they recommend more power? My system: Processor: Intel 3.6Ghz Mobo: Intel D915GAV HDD: 120GB Maxtor Others: Plextor CD-RW, Pioneer DVD-Rom. Please advise ASAP whether I should go for a larger power supply, say, 400-450W. Thanks.