[Beowulf] 90nm opteron power usage
hahn at physics.mcmaster.ca
Mon Aug 8 16:37:42 PDT 2005
> Anyone know how much the memory could contribute to the overall power load?
fairly minor: I just looked at a micron 512MB dimm that had a
peak draw of ~8.5A at 2.6V -> 22W. that's for a dimm with the max
number of chips, operating bank interleaved, one read per cycle.
a real system could never manage that. a same-spec device with
half the number of chips dissipates half the power, and a more
realistic full-load dissipation is more like 2A -> 5W.
so figuring ~30W of memory in a dual-opteron is probably reasonable.
that's real dissipation, of course - call it 45W when measured at the wall.
> > I managed to hook up my kill-a-watt to a dual opteron 2.6 GHz, 4GB pc3200,
> > and a 73GB scsi disk (a sun v20z). The highest power consumption I
> > could find was was running 1 distributed.net client per cpu.
> > The results was 197-198 watts and 200-201 VA. I'm quite impressed,
> > our 2.2GHz version of the same box is in the 270-300 watt range.
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