A bit of a late reply, because Orly's message was tossed into gmail's spam folder. (Bad gmail!)
I think we need to qualify these statements a bit. Orlando Andico wrote: > Even if your P/S is very high power, it won't draw much power if your > parts are not sucking that power. I posted a similar claim last Sept 24, 2005 at 10:48:51AM PHT. Guideon Guillen said that these high-rated switching power supplies might consume unnecessary power than you'd want them to. I've attached Guideon's message along with Eric Pareja's prior reply. ------------------------ begin excerpt Guideon wrote: > Jun is right, Jijo. The higher wattage rating of the PSU doesn't > necessarily reflect actual consumption, only the maximum output > capacity of the unit. Not really. It depends on a PSU's efficiency. A PSU's efficiency is not constant value. It varies depending on the load. It's like a bell curve. Peak efficiency is only at a certain amount of load but lower for curves less than or greater than than at max. efficiency. Now, why a PSU's efficiency affect the actual consumption? Because power conversion is not a 100% efficient process. Some electrical energy is lost (resistive and transient elements, transformer losses, etc.). So it's possible that a 300W PSU only has 70% efficiency at 250W load, but a 450W PSU only has 65% efficiency at 250W load. This depends on how the PSU was designed, of course. ------------------------ end excerpt > It's like an engine: if you have a > BMW M5 with 500hp but you're just crawling around in Makati traffic, > you will not consume much more gas than the guy with a Toyota Corolla > with 105hp. > If they have the same piston displacement, and in your example I'm sure the M5 and Corolla don't have the same displacement... Which also supports the PSU efficiency rating factor...
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