GeForce 9800 GT Need more power?

Hp hewlett-packard / PAVILLION
December 25, 2008 at 06:56:10
Specs: Windows Vista, 2 GB
I Just got the NVIDIA GeForce 9800 GT by PNY and I realized that my power supply is a very low 250W, while this honkin mo' needs at least 450W. Or does it? I am replacing the PSU soon, but for now can I run it?

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December 25, 2008 at 08:10:21
I wouldnt risk it

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December 25, 2008 at 09:59:28
"I am replacing the PSU soon, but for now can I run it?"

NO! Do NOT chance it! A PCI-e card that requires a single 6-pin connection can draw up to 150W. With a 250W PSU you're bound to have problems & may even damage the hardware, then you'll really be sorry.

Also, a 450W PSU may or may not be depends on the specs, primarily the amperage on the +12v rail. You should get a unit that has a single +12v rail of no less than 30A & should expect to pay a minimum of $50.

This 400W Corsair PSU *should* be OK:

Here's a 450W Corsair but shipping kills the deal:

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December 25, 2008 at 20:39:59
"Also, a 450W PSU may or may not be adequate"

I've done a TON of research and I realized its not the Wattage as much as the Rail Amps.

I've noted the amp outages and can now calculate them:
TWO 12V Rails giving 22Amps apiece is 44Amps Divided by the efficiency (usally 80%) giving us a total of 35.2 Amps? (Need 26A for the video card.)

Is this correct???

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Related Solutions

December 25, 2008 at 21:20:07
If a PSU has two or more +12v rails, +12v2 is used exclusively* (see note) by the CPU. So if your CPU only requires a max of say 8A, the remaining amperage on that rail is unusable by the rest of the system. All other hardware that requires +12v power gets it from the +12v1 rail.

*NOTE: the ATX12V standard recommends using the +12v2 rail for the CPU ONLY, however some manufacturers tap into it for other uses & I believe some use +12v1 for the CPU rather than +12v2.

I have a huge number of PSU related sites bookmarked. Here's a few that may help:

BTW, the 26A recommendation is for the entire system, including the video card...not just for the video card alone. If you go to the following link & scroll down to the power consumption chart, you'll see idle & load wattages. These numbers are for the entire system.

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February 3, 2009 at 05:03:57
I got the BFG Tech GS Series 650W.
Works perfectly I have had no problems.

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