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Re: Energy consumption vs % utilization?
On Tue, 26 Oct 2004, David Lesher wrote: > > Speaking on Deep Background, the Press Secretary whispered: > > > > > > You should be able to pick up simple current / wattage meter from local > > hardware store for $20 or so. That will tell you that on a modern > > dual-CPU machine the power consumption at idle CPU is about 60% of peak. > > The rest is consumed by drives, fans, RAM, etc. As wattage the > > difference is 100-120W (50-60W per cpu) > > Bogus data alert.... > > A ammeter will tell you amps. But in the world of switcher power > supplies, that does not beget watts. [Why? is an exercise for > the student. Start with "power factor" and "VARS" and worry about > asymetric loads...] > > If you want to talk watts, as you must to worry about HVAC, > or really watt-hours... acquire a power company type meter - in > glass with a whirlygig. Put it in a meter box with plugs. [See > your local eletrical wholesaler..] > > (The rotating disk watthour meter is amazingly accurate under > almost any kind of load waveform. Only time-of-day metering has > spurred the utilities to replace them.) > > Plug the machines into it; it into the wall. Note the numbers > and the time, and come back in 24Hours. Instead of doing all this, just buy a Kill-A-Watt meter for about $30, and get an instant reading of Watts, Amps, VAs, power factor, and KWH. K