I need a new power supply for my IBM computer?

Do you have the Model # for the PC?

Below is a link that has them:

First, open up the computer case, look at the dimensions & specs of the existing PSU and note EVERYTHING on paper.

Next, for the right way of calculating the power a PSU must give out, you MUST look at the BIG picture and take many other things into account not just the graphics card.

The real lowdown on how much power is needed for PC systems !

For your reference, following are details that illustrates approximately* how much wattage you will need to run various normal common components in a PC system ( the components are on the left and the wattage required on the right):

The Motherboard: 15-30

Midrange to high-end CPU: 40-100

RAM: about 7 per 128MB (or 56 W per GB)

AGP/PCI add-in card: 5

High-End graphics board: 60-100 (some take more)

IDE/SATA hard drive: 10-30

Optical CD/DVD drive: 10-25

So let's calculate a system (again, this is an approximation*) with a midrange motherboard and CPU, 1 Gig of RAM, 2 AGP/PCI cards (including one graphic card), 1 hard drive and 1 optical drive.

That would be 30+70+56(128MB X 8 X 1 = 1Gig @ 7 per 128MB)+10(2 X 5)+60+30+25 = 281

* It has to be an approximation as I'm missing all the other details of your system.

So compare your entire computer specs with the list and refine the math on your own, you will then know what new PSU you should get.

NOTES:

Leave yourself a bit of slack in your calculation for future hardware - Example: As calculated above, I would consider a PSU of at least 300 Watts and get up to 400 Watts if the price difference is not too much for you.

Also, always compare PSUs on cost AND caliber, in other words, go for power supplies that have a "quality build" never for one where the cost is cheap (because you can be sure it's not only the price that is that way).

And whatever power output you choose, get one in the same size (form factor) as the one you have now !

P.S.: My guide is partly based on this link: http://static.tigerdirect.com/html/powersuppliesGu...