Tom's Hardware > Forum > Graphic & Displays > Graphics Cards > [Solved] Crossfire power supply question?
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Hags   10-13-2009 at 05:27:00 AM

I recently built my pc and didnt think I wanted to crossfire but now I want too. BUT!!! I got a psu with only 2x 6 pin connectors and 4870 take 2. So my question is can I use 1 6pin on each card and use a 6pin to 2molax connector on differnt molax lines on each card? The only issue i see is not enough amps but if that is the only issue what harm would it cause ?? (poor performance??) Thanks in advance

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------------------------------ Ph II x4 955 @3.6ghz 100% stable, 2x2gb ram 1600mhz, and 4870 1gb 790/1100 in a CM690
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Best answer from dirtmountain
It should work with no problems, split the 6 pin and the 8 pin to each GPU using the 12V3 rail and a molex connector to each card off the 12V2 rail. I'd usually rather see a 750w with the 4 PCIe connectors for crossfiring 4870s, but i wouldn't replace the 650w Earthwatts in your case.
http://www.jonnyguru.com/modules.p [...] y&reid=110
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Bluescreendeath   10-13-2009 at 05:29:15 AM

What is your PSU? (Info on wattage, amps, and if possible amps for wattage output)

A 4870 needs two connectors or it won't boot. Two of them needs 4. Overloading your PSU can kill your computer.

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jsc   10-13-2009 at 05:38:41 AM

Hags wrote :

The only issue i see is not enough amps but if that is the only issue what harm would it cause ??


Probably none. But you'd get a lot of random reboots during periods of heavy 3D loads - games.

Reply to jsc
Hags   10-13-2009 at 04:46:58 PM

My psu is earthwatts 650 so it should have enough juice but I'm not sure heres the link http://www.newegg.ca/Product/Produ [...] 6817371015

------------------------------ Ph II x4 955 @3.6ghz 100% stable, 2x2gb ram 1600mhz, and 4870 1gb 790/1100 in a CM690
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dirtmountain   10-13-2009 at 08:22:41 PM
Best answer

It should work with no problems, split the 6 pin and the 8 pin to each GPU using the 12V3 rail and a molex connector to each card off the 12V2 rail. I'd usually rather see a 750w with the 4 PCIe connectors for crossfiring 4870s, but i wouldn't replace the 650w Earthwatts in your case.
http://www.jonnyguru.com/modules.p [...] y&reid=110

Reply to dirtmountain
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