Need help upgrading PSU

Hi there,

I am a novice when it comes to modifying my computer...I have a HP Pavilion a1357c Desktop and it has a 300 watt PSU. I wanted to upgrade the video card to something like an AMD Radeon HD 7770 or around that performance level, but I believe I will need to upgrade the PSU. Can anyone tell me a good PSU between 400-600 watts that are good for this model? Or how can I tell on my own? Thanks a lot for any help.
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  1. This shall do the trick:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371045&Tpk=Antec%20Vp-450

    Technically on a combined 12v rail you just want 23 amps. VP-450 has 36 amps which is more than enough.
  2. You guys are the best. Thanks.

    I notice that all of these are ATX12V. I guess that is what I should be looking for?
  3. pretty much...
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