EVGA Geforce 8800 GTX and SLI power requirements

I was wondering if anyone tried to put in another 8800 GTX in there system with a power supply of 680 watts? I have heard depending on the maker of the PSU it is possible. I usually play games @ 2560X1600 and I have to turn some stuff off to get more FPS. At this resolution even my 8800 GTX seems to slow a bit. I am planning on getting 2 more gigs of the same ram today. Does anyone think the sequence of the ram will make a difference. Such as, 1st slot (512X2) 2nd slot (1GbX2) or vice versa? Here are my systems specs:

Intel C2D E6600 OC'ed to 3.0 Ghz, FSB 1333 (333X9) Vcore @ 1.35v
Asus P5N-E nForce 650i SLI Chipset
1GB Corsair XMS2 Xtreme Memory PC6400 DDR2, Timings @ 5-5-5-15 T2
EVGA Nvidia GeForce 8800 GTX 768MB PCI-E
320GB SATA-II 3.0Gb/s 16MB Cache HDD
Apevia 680W Iceberg Power Supply
Logitech X-540 70 Watts 5.1 Speakers
Logitech G15 Gaming Keyboard
Logitech MX518 Gaming Optical Mouse
Sony Q170A 18x Double Layer Dual Drive
Microsoft Windows Vista Home Premium
Dell UltraSharp 3007WFP 30 inch LCD
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More about evga geforce 8800 power requirements
  1. If you want the best quality out of your ram, then run it in dual channel.

    As for your powersupply, if your going to SLi 2 8800GTX's, then can it for this:


    Also if you want the best quality from your games, boot on XP. Vista currently makes games crappier, lower fps, less programs are apt for vista, etc.
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