Tom's Hardware > Forum > Homebuilt Systems > General Homebuilt > GPU Upgrade: Shared 12V Rail a Problem?

GPU Upgrade: Shared 12V Rail a Problem?

Forum Homebuilt Systems : General Homebuilt - GPU Upgrade: Shared 12V Rail a Problem?

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Syfted   10-15-2009 at 06:16:09 PM

Hey all,

I'm running an OCZ 700W GSX,
http://www.techpowerup.com/reviews [...] s/psu1.jpg

And as you can see, CPU2 and PCI-E 2 share a 12V rail.

I'm running a Core i7 920 on a P6T Deluxe, so both CPU 1 and CPU 2 are being used.

Right now I'm running an 8800GT (one PCI-E) but would like to upgrade to ATI's 5850 (two PCI-E). Will the shared rail be an issue?


PS: Also, while I'm here, what are the differences between cards manufactured by ASUS vs XFX vs Sapphire, etc? I've noticed XFX cards run about 10% more expensive, typically.

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kufan64   10-15-2009 at 06:39:08 PM

I don't think it should be a problem, but for further reading, I refer you here:
http://www.playtool.com/pages/psuoverload/overload.html

There is ususally very little difference between different manufacturers of the same card. Deciding on what manufacturer to buy from usually comes down to just a couple of things:
Price
Warranty
Technical Support
Aesthetics/Brand Name

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Bronze Home Brew badge WR2   10-15-2009 at 06:46:04 PM

A shared rail is not a problem unless the amperage on the shared rail is some absurd low value. Since the CPU and GPU both get power from other sources as well as the shared rail it's unlikely to be an issue. 18A * 12W = 216W and we know that 6 pin PCI-e connectors only supply 75watts of power. That leaves ~140watts for the CPU in addition to what the CPU takes from the other CPU rail.

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