The 2GB dimms emit the same heat as the 1 GB dimms. So if you have a 1000
node cluster, and you use the larger (slightly more expensive) 2GB dimms vs
the 1GB dimms, you will emit somewhat less heat. I haven't done the
assuming the same number of chips per dimm. if your 1G are single-sided,
and 2G are double, you save nothing. it's also interesting that for a given
generation chip, the higher-clocked dimms are significantly hotter
(say, 200 vs 300 mA max draw for 1G pc2/667 vs /800).
also, I notice that x16 chips dissipate a lot more than x4 or x8, even
though the chips have the same number of onchip banks. I guess this says
that the main power issue is driving wide parallel buses at speed...
That and few parts means lower absolute number of failures, but that is
another issue.
a very interesting one. I wonder how many people have scrubbing
turned on in their cluster, and how many use mcelog to monitor the
ECC rate. comments?
thanks, mark.
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