On Wed, 2010-03-10 at 19:11 -0800, John Reiser wrote: > > MultiGHz, Multicore CPUs consume magnitudes more power than HDs. > > Not always. A typical 3.5" harddrive consumes about (max): > 0.65A * 5V = 3.25W > 0.50A * 12V = 6.00W > which totals 9.25 Watts, and less when not transferring data. > I am composing this message on a system with a 2.5GHz, two-core > processor that consumes 45 Watts maximum, and less when "idle". > So in this case the ratio is closer to 5:1, not 10:1. That doesn't compare to figures that I have seen - a lot of 7200rpm hard disks will draw up to a couple of amps on the 12v line (at least, during startup) giving you peak power consumption in the 20-30W range. The lastest data sheets I can find for Seagate's Baracuda 7200 drives for e.g. quote a maximum draw of 2.8A (33.6W). Admittedly that's a peak value and not an average but so is the 45W processor figure; I think claiming that modern CPUs consume "magnitues more power" than modern hard disks is not justifiable. Regards, Bryn. -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
