How much power does that system use at full-tilt? I'm guessing about
2250 - 2500 kW.
Prentice
On 08/22/2016 07:40 PM, Stu Midgley wrote:
I measured the power draw of our 2RU 8 phi nodes with and without
fans... the fans draw about 20% power.
On a 2200kW node that's considerable.
On Tue, Aug 23, 2016 at 5:36 AM, Mark Hahn <h...@mcmaster.ca
<mailto:h...@mcmaster.ca>> wrote:
Extra, the direct contact cooling stuff must still have the
fans in the
nodes to keep the dimms/disks/power supplies cool... thus use
considerably
more power than nodes without fans.
why do you say "considerably"? 1u muffin fans are annoying and
not that efficient, but even 1U could still use blowers. and it's
not as if
you need a lot of airflow to keep 5-20W of support hardware cool.
(that would be for non-extreme numbers of disks/dimms/nics -
though it occurs to me that motherboards also have some power
regulation in them,
and if 2 sockets are drawing 250w, then 90% efficient regulation
would still mean 28W extra heat to dissipate.)
iirc a typical 1U fan dissipates up to ~3W, but that's only when
running full on (screaming 14krpm...). not to mention the wide
availability of simple 4-system-in-2u chassis (more efficient fans).
--
Dr Stuart Midgley
sdm...@sdm900.com <mailto:sdm...@sdm900.com>
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