It is an inexact science, due to all the manufacturers that refuse
to provide useful info about device power consumption.
Your processor draws 130W max. This is drawn from the 2x2 ATX 12V
connector. I assume the Vcore converter is 90% efficient. The
current draw from +12V is (130W/12V)*(1/0.90) = 12 amps.
http://processorfinder.intel.com/scripts/details.asp?sSpec=SL94P
Your video card is another big power consumer. A high end video
card is worth including in the calculation.
Your disk drive needs 2amps from the 12V rail during the first
10 seconds or so. The 12V power drops down to 0.5 amps once
the disk is fully up to speed.
To do a complete calculation, of the 12V current draw, I need
to see the exact brand and model of power supply (so I can look
up the ratings printed on the label), plus I need a detailed
list of all hardware. Then I can tell you a bit about your
proposed setup.
This isn't exactly rocket science. The toughest part is finding
good articles on web sites, where some investigator has measured
the power, so that we have some estimates. Then it is just a
matter of adding it all up.
You can use sites like this, but they hide the details, making
it harder to comment on whether the determination is being
done properly. To do this job properly, the power supply
calculator web page should report how much 3.3V @ X amps,
5V @ Y amps and 12V @ Z amps. Knowing the total power ("460W"),
doesn't tell us whether the power supply has good 12V capabilities.
http://www.jscustompcs.com/power_supply/
The Takaman site in Japan used to be good for doing estimates,
but while the domain still exists, the server appears to be
broken.
Paul
