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 > -- > Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/ > Hints for IPv6 on FC6 http://www.wsrcc.com/wolfgang/fedora/ipv6-tunnel.html
