[Beowulf] 90nm opteron power usage

Glen Gardner Glen.Gardner at verizon.net
Tue Aug 9 04:44:21 EDT 2005


22 watts for ONE dimm is significant. for a motherboard with 8 such
dimms you end up with a rather huge power budget.


Glen


On Mon, 2005-08-08 at 19:37 -0400, Mark Hahn wrote:
> > 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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