A pair of 8800 GT (512MB) video cards in dual SLI mode will use about 200 watts and 17 amps at load. If you overclock your cpu, then the rest of your system will probably use somewhere around another 300 watts during a gaming session. That brings the total to about 500 watts. You'd definitely need to upgrade the psu.
Not only will you gain more performance with a HD4890/70 1GB or GTX260 216 or GTX275 than 2x8800GT SLi, but you'll also be spending less in total since you won't have to replace the PSU and selling the 8800GT to cover some cost.
The EarthWatt 500W is a great PSU for both its quality and value.
Along with this statement, I have to ask... Would my current power supply be substantial enough to run a GTX 260?
The Earthwatts 500W PSU has 2 12v rails at 17A a piece.
Hi all, I currently have an Asus 650i intel chipset, E6550 Core2Duo with an 8800GT 512mb card and was wondering, given i have an old motherboard chipset now, the 650i, with a first gen pci-e x16 port, will I get a significant performance boost if i put in a GTX275 card instead?