Re: OT? power reqs of DDR2 chips

On Monday 21 May 2007 20:50:25 Wolfgang S. Rupprecht wrote:
Dave Stevens <geek@xxxxxxxxxxxx> writes:
I'm building a new box that will use a DDR2 2G reg/ECC chip. I need to
estimate power draw for the system and can't seem to find a reference.
Its Kingston Value Ram, if that matters. The box _will_ run Fedora.

I hate to give such a non-answer, but the power consumption is so
highly determined by your usage pattern that you really can't do
anything but try it and measure using a very low impedance meter.
When running block-moves you'll probably see around 2watts per
actively accessed chip.

So the setup I envisage is a pair of SATA drives in Raid 0, to get better
access speed, and a single matching SATA outside the RAID array as the
nightly backup device. I plan to use a signalling UPS. So a worst case occurs
when there is a power failure - the UPS signals the gadget which immediately
starts to save all the work in progress. I think this will exercise the RAM
pretty briskly and at that particular point I want to make sure there is
enough power supply, hence the question.

Dave

Fedora just sitting around will consume quite
a bit less. The power will probably be dominated by the termination
resistors of ~150mw per chip, which will be your ultimate lower bound.

-wolfgang
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Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/
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