Need help finding a replacement PSU

I'm trying to find a replacement for a Bestec ATX 250-12Z Rev D2 for an old HP pavillion.
I've got a radeon 3850 that needs more power than the default PSU is providing, (12v 14A, 5V 25A, 3.3V 18A), I need a bare minimum of 20A on my 12v rail, probably 24 or 30 to be safe. The problem is, I have never replaced a PSU before and I have no clue how to go about matching it to my case to make sure it fits, and is compatible.
Can anyone point me in the right direction?
5 answers Last reply
More about need finding replacement
  1. Look at the back of the case and see if there's sheet metal surrounding the power plug. Most aftermarket power supplies have the plug located a little differently than most HP power supplies.
  2. Thank you for the fast response!
    It seems to be about a quarter of an inch of clearance between the PSU plug and the top/left part of the back plate. I'm no stranger to case modding and I'll snip it out by hand if I really have to. HP seems has a thing for having to use the jaws of life to take their cases apart.

    This is the back of the case, if it helps in figuring it out
    http://img237.imageshack.us/my.php?image=hpim0381fp4.jpg
  3. A Antec or OCZ PSU will do the job. Take a look at this:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817341012
    OCZ StealthXStream OCZ500SXS 500W
    $25 after MIR.
  4. Measure the size of the new PSU.
    Make sure it fits. Or compare to the standard ATX size.
  5. 450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended (550 Watt and two 6-pin connectors for dual ATI CrossFireX™)

    Certified power supplies are recommended

    http://ati.amd.com/online/certifiedpsu/index.html

    http://ati.amd.com/products/radeonhd3800/requirements.html
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