Date : Tue, 01 Sep 2009 00:25:13 +0100
From : jumbos.bazzar@... (Mark Haysman)
Subject: Leccy @ Acorn World '09
Hi.
If your PC has a, for example 500W power supply, that's the maximum it's
capable of providing on the DC side in total. Say now you've got a
reasonable setup that takes 350W of that 500. You have to add in the power
supply effiency, which on switch modes is usually quite high, probably 90%+,
lets take worse case scenario of 90%, so 10% is lost in the conversion, so
that's 385W of power from the mains.
I sometimes run 3 to 4 machines continuously - which can be 2 PCs, a Beeb
and a Laptop, and yes the room does get warm and I often need to put the
aircon on....which raises another question...I hope the aircon is good in
that room :-)
Mark.
----- Original Message -----
From: "Rick Murray" <rick@...>
To: "BBC MailList" <bbc-micro@...>
Sent: Tuesday, September 01, 2009 12:03 AM
Subject: Re: [BBC-Micro] Leccy @ Acorn World '09
Michael Firth wrote:
> b) Each socket is taking an average of less than 0.3A, or 80W.
Yai! Some monitors take more than that, and I'm not talking big ones...
I think my old Acorn 14" jobbie rated itself 75W, so that leaves little
for the computer. :-(
A question I have - without actually measuring, how can one tell the
power rating? For example, I believe my RiscPC power supply is something
like 83W (it's the smaller of the two). My bigger PC is something like
350W (gee, spot the difference!). Now these will apply to OUTPUT power,
yes? The amount of ooomph given on the DC side. How does one translate
that into input? If the PC thinks it is taking 350W then I'd crap myself
as turning my room on would be akin to running an immersion heater!
Thankfully I know that's not true - just looked at the meter box and
it's a lot more docile than when a heavy load is on.
Couple this with the fact that some stuff just plain lies. My satellite
receiver takes 30W. It says so. In actual fact, it runs about 3W in
standby and 20-22ish when running (prob. different LNB polarisation
power accounts for the difference?). Well, it's around 1/3 less than
quoted. Might not sound like a lot, but imagine if everybody at the
exhibition had one of them, the difference between quoted and actual
could be enough to allow a couple of coffee-makers to be included!
So there's the question. Is there any elecy-techy with some spare time
and 6502 kit who can provide some actual ratings of what stuff (Beebs,
co-pros, RiscPCs, cub monitors...) actually consume?
Would it be better to take LCD displays instead of "authentic" Cubs? The
power consumption is less, yes?
Just my ?0,02's worth. :-)
Best wishes,
Rick.
--
Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...
_______________________________________________
bbc-micro mailing list
bbc-micro@...
http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro