[Beowulf] single power supply for multiple nodes

Frank Joerdens frank at joerdens.de
Tue Jun 29 12:58:57 PDT 2004

On Tue, Jun 29, 2004 at 06:56:44AM -0700, Jim Lux wrote:
> Don't forget that you need regulated voltages, and a
> few 10s of milliohms of resistance will result in the voltage at the load
> changing under load. 2-3 meters of AWG 10 (which is fairly large) will be in
> the 10-20 mOhm range (especially with connectors). Yes, you can use remote
> sense wires back to the PS, but that brings in its own set of problems
> (stability, more wires, etc.)

Indeed, I wasn't thinking of this particular issue. That's a clincher.

> For
> distributed power conversion (as used conventionally), you're distributing
> power at a reasonably high voltage, and with exceedingly standardized (and
> cheap!) connectors and cables.

I guess it boils down to, at the end of the day, again, that veering from
the COTS paradigm doesn't really buy you anything.

Thanks for enlightening me!



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