Power Supply - Is this enough?

Hello,

After an attempt to understand Power Supplies I've fallen short of my goal and am struggling determining what is needed with a power supply. I am looking to upgrade my graphics card in my 2 year old computer and want to make sure that my power supply is ample enough to handle it.

My specs are as follows:

Intel i7 860 @ 2.8 Ghz
8.00 GB RAM
ATI Radeon HD 5700 Series - I am upgrading this to an ATI Radeon 7850 this week.

My Power Supply is factory input (I did not build this computer, had found a great deal on new egg.) I am not sure what stats are needed but this is what the label on the PS reads:
Max Power 460W
Max. Combined Power ON +12Va &+12Vb & 12Vc & +5.08V Equal to 431.24W. It's HP Branded, so a stock power supply.

Thank you for the input!
4 answers Last reply
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  1. BuckTanner said:
    Hello,

    After an attempt to understand Power Supplies I've fallen short of my goal and am struggling determining what is needed with a power supply. I am looking to upgrade my graphics card in my 2 year old computer and want to make sure that my power supply is ample enough to handle it.

    My specs are as follows:

    Intel i7 860 @ 2.8 Ghz
    8.00 GB RAM
    ATI Radeon HD 5700 Series - I am upgrading this to an ATI Radeon 7850 this week.

    My Power Supply is factory input (I did not build this computer, had found a great deal on new egg.) I am not sure what stats are needed but this is what the label on the PS reads:
    Max Power 460W
    Max. Combined Power ON +12Va &+12Vb & 12Vc & +5.08V Equal to 431.24W. It's HP Branded, so a stock power supply.

    Thank you for the input!

    What are the Amps on each 12v rail?
  2. Picture didn't turn out as planned.

    This is what the Power Supply Reads:

    5.08V = /25A +3.3V = /17A
    +12Va = /18A +5.07VSB = /2A
    +12Vb = /15A +12Vc = /8A
    - 12V = /.3A

    Is this what you were looking for?
  3. Yes. In power supplies Amps are more important than Watts. As long as your PSU has sufficient Amps on the 12v rails you should be fine. I would suggest a good name brand PSU (Corsair, Antec, Seasonic, OCZ, etc.). Stay away from the ones that are too cheap (they're cheap for a reason).
    Without knowing your budget (or what your future needs will be) its hard to recommend one but any of these should cover you no matter what:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371044 = 2 rails @ 38 Amps
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020 = 1 rail @ 53 Amps
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151094 = 1 rail @ 40 Amps
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017 = 2 rails @ 25 Amps
    If you knew for sure that you're never going to use more than 1 GPU at a time (no SLI/CFX) you could go with smaller rated PSU's (but still stick with a good name one). The above all have Amperage's above what you have now and would handle your 7850 and then some. Just notice the physical size of the above PSU's (under details) and make sure that they will fit in your case (all modern aftermarket PSU's are close to the same size). Some pre-built computer mfg's use odd size components, forcing you to use their replacements only.
  4. The power supply is good enough!
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