Add up the total power the PSU can generate, using P = IV Determine I (current) on each voltage rail (V), it's printed on the PSU.
e.g. 30A @ 3.3V = 99W 15A @ 5V = 75W etc. and add them all up. This is the PSU's total power output. The PSU will also have a plaque at the back which gives its power consumption, something like 220V, 2A. This comes out to 440 Volt-Amperes (which is different from Watts). You can assume a 0.707 conversion from V-A to Watts. Then divide the total output power, by the power consumed ( Volt-Amperes * 0.707 ) to get the efficiency. That said, switch-mode power supply technology is a mature, stable science. So you won't see any glaring differences from one power supply to the next. The differentiator would be in things like build quality, the use of high-quality inductors, etc. But on paper they will all look the same. On 7/31/07, [C]hicken [G] od <[EMAIL PROTECTED]> wrote: > With all this talk about PSU efficiency, how does one determine or measure > the efficiency of a PSU. I'm scouting the market for a new box, myself. _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List [email protected] (#PLUG @ irc.free.net.ph) Read the Guidelines: http://linux.org.ph/lists Searchable Archives: http://archives.free.net.ph
