How can I find out the amperage draw for the CPU in my PC? I want to make sure I get enough amps on the 12V rail(s) of a new PSU.
I've used several wattage calculators, which are helpful, but do not give any details on how much current is needed for the CPU. I've got an AMD Athlon 64 3200+ 2.2 GHz.
I checked AMD online tech documents, but they just list max current at 59A. That seems awfully high, given that the old PSU had 16A on a single 12V and the Antec SmartPowers I'm considering have between 15A and 19A on 12V2.
Are there any places that list the current needed for specific CPUs?
Thank you for the replies; all very helpful. I found reviews for the 3200 on the xbitlabs site which will help me make my decision. The PSU101 page helped me figure out some other questions too.
Some more general follow-up questions:
I understand how to calculate the max wattage and actual current for a particular rail, based on the info from a psu label or spec. But why would the max wattage output for any particular rail not be equal to the listed V*A? Is this determined just by the amount of resistance on the line?
Also, what if the label or specs don't list the max wattage per rail? How does one find this out? Or is that a good sign to stay away from those PSUs?