On Fri, 29 Dec 2017 21:12:55 +0000, Chris Green wrote:

T i m wrote:
On Fri, 29 Dec 2017 17:00:07 +0000, Chris Green wrote:

snip

I *still* think 12 volts 7 amps sounds a crazy amount of power for a
fanless Atom board (even including some disk drives).

I've not suggested anything otherwise, just that my friend had a 7A
PSU spare and I thought bigger might be better (considering it was
made in the Far East, was 'cheap', felt 'light' and I wanted it to run
cool rather than hot)?

It's something
like three times as much power as my I5 desktop with four disk drives
in takes.

And I wonder what capacity PSU you have in there? 450-500W possibly?
;-)

It has an 80 watt power supply. :-)

Ah, ok. ;-)

For the good reason that a
larger power supply would probably be horribly inefficient when
running at 18 watts.

Quite ('80 Plus' etc).

As I have said elsewhere, I think I'd be happy with a 'good' 5A PSU,
allowing for a little overhead and happy if it wasn't running close to
maximum design load just to get maximum efficiency etc.

But I still intend to measure it as if it really only draws what we
think it might, I could get away with something even smaller (cheaper
and easier to get). ;-)

Cheers, T i m