PSU's and SLI

[amerikanight]

What type of wattage do you guys think I should be looking at to power the list below? Im running the following:

XP Pro x86
Asus P5N-E SLI
C2D E6600 stock @ 2.4ghz OC?d @ 3-3.2ghz
2x1024mb TwinX 6400C4D
2x1024mb TwinX 6400C4
2x150gb WD Raptor Raid 0
1x300gb Seagate Barracuda SATA II
2xBFG 8800 GT OC
Soundblaster X-Fi Pro Fatality (with console)
Plextor SATA CD/DVD DL writer combo

Oh and
2x120mm fan (one on the case and one on the TRUE)
3x92mm fans (all on the case)

Im running a ThermalTake 600W Pure Power and I cant get the 2nd video card to go into SLI. Both cards work independently but do not want to go into SLI. I did have both in SLI but only up for 2 days last week and then now it just doesn?t see the 2nd card anymore. Both fans are running though but the one on the 2nd pci-e never drops to a lower RPM like it should shortly after posting. I would imagine I have plenty of power because the fan does run but not sure what your thoughts are. I?m trying to eliminate it being the PSU without buying a 1Kw and that still not being the issue?

 

[theAnimal]

600W is more than enough provided there are enough amps on the 12V rails.

If you do need a new PSU, good options would be Seasonic S12 II 500, M12 II 500 or Corsair HX520, VX550.

Have you tried without the overclock?

 

[amerikanight]

Yeah I thought 600w should be enough and Ive been trying everything at stock just to try to get it to recognize the hardware. For a couple days last week I actually got it up and running after a fresh OS install. The card was recognized and I was able to enable SLI. For that brief moment, I actually saw both cards in the device manager. Then, the next day, only 1 card showed. I thought that was weird. Ive since then reinstalled windows XP Pro X86 and both Vista Ultimate x86 and x64 to no avail.

I wonder if its my board. Because the p5n-e sli uses a hard switch card to go from single to dual vga's. Other than that flaw it has been an AWESOME board with really good overclocking. I think its got to do somehowwith that switch card or the pci bus between the 2. Because like I was saying, I noticed both fans run but only one drops to a lower rpm after posting...

well, I guess I'll be moving over to the MOBO forums here shortly to see whats good about the 780i :roll:

Thanks for the heads up on the PSU's though! My next one will definitely have modular cables support.... nothing like a bunch of unused zip tied cables stuff in an empty drive bay to make ya go nuts!!