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Which Power Supply is compatible with my unit?

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June 9, 2011 4:08:03 AM

I have an HP m8120n Media Centre PC, and I've gone through a few power supplies already. I usually would go through one a year and buy a Dynex 500W one from Best Buy. Recently I purchased a Rocketfish one from there, and it didn't have the proper connectors.

In terms of my problem, the fan on the power supply spontaneously ramps up loudly (especially when i'm gaming), and recently, it started just shutting down my machine while i'm gaming (and I can smell burning), I'd have to wait a few minutes before I can turn it on again.

My chipset is Intel ® P965 Express. I just wanna know what I should look for when I buy this power supply as far as connectors because i'm worried if I order a brand new highly rated power supply, it won't hook up to my mobo.
a c 91 ) Power supply
June 9, 2011 6:03:34 AM

Any modern day PSU will have enough connectors for your need. Just make sure you get one with enough capacity to power your rig and from a quality manufacturer such as Seasonic, Corsair, Antec.
a c 1108 ) Power supply
June 9, 2011 6:41:34 AM

What is the brand and model number of your graphics card?
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June 9, 2011 2:57:32 PM

I'm currently running a 512mb 9800GT made by Zotac. I have a dual monitor setup at the moment. I'm not concerned with connectors for my peripherals, my main concern is with the motherboard connection.
a c 1108 ) Power supply
June 9, 2011 4:36:59 PM

For a single GeForce 9800 GT graphics card system NVIDIA recommends that the power supply unit have at least 400 Watts or greater with a maximum combined +12 Volt current rating of 26 Amps or greater.

Did the power supplies that have been purchasing have a maximum combined +12 Volt current rating of 26 Amps or greater? If they were lower that would explain why you have been going through a power supply a year which is abnormal. The power supply's wattage is not the critical specification. The +12 Volt current rating is the most critical followed by DC output quality.

That Rocketfish power supply should have met the ATX12V v2.3 revision and have all the required power connectors.

The problem you experienced with the power supply's fan ramping up and the smell of burning electronics while you were gaming tells me that the power supply was overstressed and its protection circuits were triggered. That's a sign of a power supply with inadequate specs.
June 10, 2011 2:41:06 AM

ko888, I've attatched the photo of the specs on the side of my PSU since I don't exactly know how to properly read the voltage and amperage ratings on the box.


Emperus, I believe it's a 20 pin, and there's another 4 pin that connects on another section of the motherboard, so those PSU's that you've linked should all work properly?

I appreciate everyone's help.


a c 1108 ) Power supply
June 10, 2011 3:21:16 AM

That Dynex DX-PS500W made by Huntkey is 500 Watts Peak and 400 Watts Continous. It should have a maximum combined +12 Volt current rating of 29 Amps Peak and 23 Amps Continuous.

It doesn't meet the minimum of a combined +12 Volt current rating of 26 Amps or greater continuous recommended for a single GeForce 9800 GT graphics card system. That's what's causing the shutdowns and burning smell and why you have to wait for the protection circuits to reset.
June 10, 2011 7:03:34 AM

That all makes sense thanks ko888. As far as the power supplies linked by Emperus, they all have a 20+4 pin connection (which appears to be one piece), but will this work with my 20 pin connector?

I'm sorry for all these silly questions, computer hardware isn't really my forte.
a c 91 ) Power supply
June 10, 2011 10:36:47 AM

They will work. Don't worry about it.
a c 1108 ) Power supply
June 10, 2011 3:00:22 PM

k0mod0 said:
That all makes sense thanks ko888. As far as the power supplies linked by Emperus, they all have a 20+4 pin connection (which appears to be one piece), but will this work with my 20 pin connector?

I'm sorry for all these silly questions, computer hardware isn't really my forte.

A 20+4 pin power cable has two pieces: a 20 pin piece, and a 4 pin piece. If you leave the two pieces separate then you can plug the 20 pin piece into a 20 pin motherboard and leave the 4 pin piece unplugged.

!