> Basically the colocation place i've selected for the device has a limit
> of 0.5 Amps of power per box, so need to keep the power down below that
> limit otherwise it'll cost more to host.
> 
> ...
> Any ideas how to do the power calculations greatfully received,

0.5A seriously? Yikes that is not a lot of power for a server, that's 
only 120 Watts (240 V * 0.5A = 120 watts).

The low end server you've specified (AMD CPU, 4 sticks of RAM, standard 
motherboard etc) is easily going to draw 120 W when idle, at load its 
going to be more like 300. A modern AMD CPU will be 80W on its own, then 
the 1GB of RAM is 10 W (40W), the motherboard is often 40-60W, hard 
drives are roughly 20W, you are massively over your power budget even 
with this basic machine setup.

I can think of 2 configurations that might get within 120W peak usage:
1) Use laptop components, ie ultra low usage CPU and memory + reduced 
capability motherbiard and a couple of 4200 rpm hard drives.

2) Use an embedded chip such as the VIA C7 which you should be able to 
get with a max power draw of around 20 W, combined with their 
motherboard and 2GB of RAM you should again be able to spec something 
below.

Either way you are not going to be looking at a server class machine, 
for a reasonable server you are realistically looking at needing 1.5 - 
2.0 Amps per machine, which will get you a dual core, 4GB of RAM and 2 x 
hard drives basic setup. If possible find another colo - because it 
sounds like they have serious power problems.
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