General discussion

Changing Power Supply Unit

I want to change power supply. How does a dual fan mount (specifically with re: to top/bottom fan). My tower doesn't have vents on top, will it mount fan to bottom, or better to go single fan?

By my calculations, I should have close to 300W supply in the system (but was leaning toward a solid 400W). Any thoughts/disagreements?

My current Power Supply Unit - max output 250W (I was/am having frequent shutdown) This seems rather small. I'm running AMD Athlon XP 2800, 120 GB harddrive, 512MB DDR SDRAM, NVIDIA GeForce 4MX Graphics. Notably system has a DVD, and CD-burner.


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Go 450 W or higher

anything less will wear out trying to pull the rest of the train.....

As for the fan location, you could cut a hole in the top of your case and mount a wire cover over it with a couple of screws so the fan on top of a power supply can be accommodated. Otherwise see if you have other areas in the back for fan circulation...there are some made that mount to the open slot holes that pci type cards would use to be screwed to the case (the fan doesn't actually go into the slot, it only uses the back hole mount area). I've used those types in order to pull/push air inside the case to keep things cool. They plug into extra power plugs and are identical to the type you use on the back of a cdrom or harddrive. If you don't have enough of them now, you can buy Y adapters that give you a couple of extras.


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Quality over Quantity

Not all power supplies are created equally, and there's nothing like an Athlon CPU to prove that point.

I would suggest going to AMD's website, where you can find a list of recommended power supplies. Buy something from that list, as opposed to some generic power supply and just hoping that if you get a high enough wattage it'll be enough.

A lot of cheap PSUs never actually deliver anything close to their advertised power output, and are much more prone to failure. Combined with the Athlon's knack for requiring massive amounts of power really fast when it kicks into high gear, and you can easilly kill lesser power supplies.

Pick something off the list at AMD's site, and then pick a model that's at least 350W.

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The power supply mounting is "keyed"

Note that the four mounting screws are NOT symetrical. Only one possible way to mount it and use four screws.

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So even triple fan ones [I have one]

will mount properly. No, I did not feel that I had a need for a triple fan.

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Pick one

There are so many p/s units out there, just pick the one that suits you and is still at least 400W or better. ASK, always ask to see the vendor or any FAQ on a certain model p/s unit when available. The dual fans setups don't always(top fan) blow out but in and the rear fan blows out. -OR- as you've noticed, due to case design, if blowed up the benefit is nil. However, you can "make" a hole arrangement to vent/exhaust the heat. A simple screened hole or yet another fan. -OR- route the fan to best your "jerry rigging" process. Stick with a single fan maybe a large one for quiet operation. Keep searching...

enjoy Happy -----Willy

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Don't be chopping up your case!

Don't go cutting up your case for a new power supply. Most cases will provide you with the mount for an additional fan. There are even fans you can mount in a card slot spot for blowing air out.

The quality of power supplied is more important than the number of fans.

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Yes the second fan pulls air into the supply

from the interior of the case. Usually it is plugged into the mobo as a temperature controlled fan and changes speed as needed to control temp.

Why would one expect the inside fan to blow into the case???????????

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