Question about the 9800GTX and my PSU

420 Views 10 Replies 8 Participants Last post by linskingdom, Mar 19, 2009

RedSB

Discussion Starter · Mar 19, 2009

I don't know a lot about how a PSU works, or things like rails and such. From what I understand the 9800GTX card needs 24A on the 12V rail. The power supply I have is the Ultra X-finity 600W. It has 2 12V rails, one at 18A and the other at 20A. Do these numbers combine to give me the 24A I would need to run the 9800GTX, or would I need to look at upgrading to a single rail PSU that has the appropriate settings?

Any help would be appreciated.

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TFL Replica

· #2 · Mar 19, 2009

On a dual rail PSU, one rail is used for the CPU. Any remaining amps on that rail will be unusable for GPUs and the like. Leaving you with just 20A for use with a GPU that requires 24A. Even if it does boot up you may get random shutdowns or even worse.

My advice is to get a good PSU for a reputable brand such as Corsair, PCP&C, Seasonic with sufficient amps on the 12v rails.

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RedSB

Discussion Starter · #3 · Mar 19, 2009

Thank you very much for your quick reply

. Looks like I'll have to look at upgrading my PSU before upgrading the video card.

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corky dorkelson

· #4 · Mar 19, 2009

Quote:

Originally Posted by TFL Replica

I disagree, that PSU will have plenty of power to run a GTX+, regardless of the dual-rail design. The GPU does not need all 24 amps. That is the recommended minimum for the TOTAL number of amps, which in his case is 38.

I run a 9800GTX+ on a dual-rail 400W PSU 24/7 @ 100% load with [email protected] I even fold on the CPU. No problems whatsoever.

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man03999

· #5 · Mar 19, 2009

Yeah go with Corsair , they are good psu maker.

Edit: The 9800 GTX uses one six-pin PCI Express power connectors and requires a 450-watt power supply.

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Demented

· #6 · Mar 19, 2009

Quote:

Originally Posted by man03999

Yeah go with Corsair , they are good psu maker.

Edit: The 9800 GTX uses one six-pin PCI Express power connectors and requires a 450-watt power supply.

Actually my 9800GTX uses 2 6pin PCIe connectors.

I also agree that the power supply the OP has is definitely sufficient. Before upgrading to my 700w, I used a Rosewill 600w PSU for almost a year with no issues.

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CrazyNikel

· #7 · Mar 19, 2009

Ya..that was bad advice on the response, I easily handled SLI 9800GTX+ with 2 6pin connectors on a 600watt psu with 2 12volt rails with 20a on each rail(i think) could have been 18a

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TFL Replica

· #8 · Mar 19, 2009

Whether the 9800GTX actually requires 24A is a different debate. According to the way dual rail PSUs work that would be insufficient. It could be that manufacturers always use safe estimates for requirements. However: Better safe than sorry.

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RedSB

Discussion Starter · #9 · Mar 19, 2009

Thanks everyone for the replies and information. I appreciate it very much.

With the couple of differing opinions given, I decided to get in touch with XFX's support techs, and lay the question out to them. According to their tech, I should be just fine with my current PSU, as long as I have the two 6-pin connectors, which I do.

Again, thanks for the help

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Maddog7771

· #10 · Mar 19, 2009

Singel rails rule

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linskingdom

· #11 · Mar 19, 2009

I think the Ultra X-Finity 600W may do around 400w on 12v. With that says, the GTX is a 168w GPU with E6300 at 3.2G, it makes a cut.

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