Is my power supply enough for GTX 480?

December 18, 2010 at 00:10:18
Specs: Windows Vista
I'm looking to buy a new video card, and I have my eyes on an nVidia GeForce GTX 480.

It says that the minimum power should be at least 600 watts with 42 amps on the +12V line.

My current power supply is 680W with two 12V rails at 43A (21A on one, 22A on another).

This just barely meets the minimum. I was wondering if it's ok, or do I need a better power supply?

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December 18, 2010 at 01:03:17
The trick is to balance the load across the two rails. You need to identify which rail supports the PCIe card and minimize the other devices hanging off that rail. With a multi-rail system you run into problems at peak load. If too much is attached to one rail you can overload it while un-used capacity in the other rail is wasted. With a single rail system all the output is available to meat peak demand.

Goin' Fishin' (Some day)

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December 18, 2010 at 01:46:30
Gtx 480 use 186w idle and 386w underload. U have two +12v rails, one rail is already trapped(CPU) now u have other +12v rail to feed power hungry v-card and other components.
if u do the math (W=V x A, 12v x 21A=252W or 12v x 22A=264W), as u can u see both +12v@22A or +12V@21A can't provide enough power to run gtx 480. Better look for another v-card i recommend gtx 570(+12v@35A 550W) or gtx 460(+12v@26A 450W).

We can not fight new wars with old weapons, let he who desires piece prepare for war - PROPHET.

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December 18, 2010 at 07:06:50
"My current power supply is 680W with two 12V rails at 43A (21A on one, 22A on another)"

Adding the +12v amperages together is NOT how it works. Look at the label on the side of the unit & see if it rates the combined +12v rails. For instance, the following Antec label shows three +12v rails at 18A each for a combined wattage of 504W:

The total amperage is NOT 3 x 18A = 54A, it's 504W / 12v = 42A

Regardless, 680W isn't a popular size & a quick look at newegg shows only garbage units by Apevia, Okia & Sunbeam. I wouldn't trust any one of them on a high end system. The GTX 480 sells for about $400 so you should have a decent quaily power supply to protect your investment. And hopefully you have a top of the line CPU (Core i7) & lots of RAM or the GTX 480 is just going to be wasted on your system.

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December 18, 2010 at 12:04:25
You don't need an i7 to take advantage of the GTX 480. A Core i5, Phenom II X4, or Core 2 Quad would do just fine.

I do agree with mickliq that you need a new power supply to run that card, and I agree with kuwese that the GTX 570 would be a better buy. It's cheaper and faster than the 480. Less and more! :P

Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182

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