[Beowulf] power usage, Intel 5160 vs. AMD 2216

Peter Kjellstrom cap at nsc.liu.se
Fri Jul 13 12:44:50 PDT 2007


On Friday 13 July 2007, Greg Lindahl wrote:
> A few years ago we were trying to estimate power consumption by
> DIIMMs, and found that the measured number was much lower. Apparently
> they aren't all "on" all the time. So you can't estimate it the way
> you're all doing it.

I agree

> FBDIMMs seem to be "on" quite a bit more.
>
> I'd love for someone to whip out a kill-a-watt and start comparing the
> same machine at different dimm counts.

done that, the result, my hynix 2G FBDIMMs ate just above 10W a piece at idle 
and not much more at full load. This server had 16 DIMM slots so that was 
>165W for the memory... The CPUs were 2x 80W tdp which in reality is no where 
near 80W. So in the end, more power went to the DIMMs then the CPUs.

/Peter

> -- greg
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