Re: combining 2 power supplies
- From: "Dave (from the UK)" <see-my-signature@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 28 Mar 2006 16:35:18 +0100
James Sweet wrote:
There's a lot of wattage inflation these days,
True.
following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives.
But I don't belive that 250 W drawn from the mains is a likely maximum now.
I was doing some calculuations the other day based on a pair of Opterons. According to AMD, they are about 100 W each. A very mediocre graphics card is probably 30 W. Disks take more when they spin up.
350 W is probably adequate for most things I would agree. My main PC (I don't use PCs much) has a 235 W power supply in it, but a pair of 450 MHz Pentiums and a 10,000 rpm SCSI disk. That seems to be OK
A more elegant solution if there are multiple disks might be to build a timer that delays the starts on them, as the power when running is probalby only half that when starting.
Personally, I think I'd just rather buy a bigger psu - they are not that expensive now.
--
Dave K MCSE.
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