Settiing up 8800GTX in SLI - need help!

[avi8tir]

I have had a single Asus EN8800GTX for wile. Just picked up a used one on ebay so I set it up in SLI.

My issue is with the power supply. My power supply only has 2 PCI-E cords. Each EN8800GTX requires 2 for a total of 4 required.

what do I do?

 

[emp]

Buy a new power supply? Seriously, it depends on how powerful is your power supply, because even if you use the Molex-to-PCIE adapter, it might not be powerful enough to support such a power consuming setup,

 

[bruce555]

What's your total PSU wattage? Well what maker/model.

From there you can take standard 12V molex's and go to your local store and pick up 2 molex to 1 pci connector if you have to power available.



EDIT: ^ Beat me, he's pretty much right though, you probably don't have enough power to run the setup if your PSU doesn't have all the connections.

 

[avi8tir]

this is the PS I have:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817159058

700w should be enough, right?

 

[warezme]

hope you get yours running, SLI is really nice, must be had to be appreciated. With the right CPU the combo it is so good you will be very hesitant to upgrade for a long while.

 

[warezme]

this is the PS I have:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817159058

700w should be enough, right?

Should be plenty all you need is some adapters then.

 

[emp]

Barely cutting it with "supposedly" 41A on the 12V rails. Coolmax is not a reliable brand to be honest, I suppose you could try if you want with some adapters, but I wouldn't use it if it was my PC.

 

[hypocrisyforever]

I run 2 overclocked 8800gtx's off of a 700watt thermaltake toughpower, I run just fine and im overclocked to ultra speeds.

 

[emp]

I run 2 overclocked 8800gtx's off of a 700watt thermaltake toughpower, I run just fine and im overclocked to ultra speeds.

You are aware that first of all, thermaltake is leaps and bounds above Coolmax in terms of quality, right? Plus their rail ratings are pretty accurate, which is more than I can say about lower quality PSUs. I've seen cheap 650W PSUs rated for 40A get fried when put under a 20-25A test.

I am not saying not to use it, I am saying that *I* personally wouldn't use it and if you do decide to use it, then you should investigate the quality of that particular model before making a move.

EDIT: Done the research for you, here's a jonnyguru review about your particular PSU. (In case you didn't know, jonnyguru reviews are extremely detailed, respected, and accurate as far as PSUs go)

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=68

 

[avi8tir]

ok, got it set up with my current PS. Will consider a new one if I have any issues.

I have turned SLI on in the nVidia control panel, but how do I know if SLI id working?

 

[invisik]

download gpuz and it should say 2 gpu enabled. or boot up a game and ull see a difference in performance.

 

[avi8tir]

ok, all is working now. I ran gpuz and it looks like the used one I bought on Ebay has been overclocked. GPU Clock is 576 Mhz on my old one and the one from Ebay is 612 Mhz.

What should I do about this? do they both have to be at the same clock speed?

 

[Mousemonkey]

No, just put the faster card into the PCIe 1 slot.