[SPAM] [Beowulf] powering up 18 motherboards

Dean Johnson dtj at uberh4x0r.org
Thu Feb 17 17:22:12 EST 2005


Howdy,
Correct me if I am wrong. Presumably your cpu's have fan kits and if you
may have case fans (or something). Do the motors on fan's not draw more
initial amperage at startup? Thus you would have an initial spike.

	-Dean

On Wed, 2005-02-16 at 20:10 -0500, Alpay Kasal wrote:
> Hello all… I have a question about powering on motherboards
> simulataneously…
> 
>  
> 
> I have 18 identical mobo’s right now with identical ram, cpu, and hard
> disk. I hooked one up to a kill-a-watt and found that it draws 140-150
> watts when powering on, and stays level at about 90-100 watts
> afterwards. The problem is that I am setting this up at home, where I
> only have 10 amp circuits (and only a couple of them can be freed up).
> Correct me if I am wrong here please…
> 
>  
> 
> 1 mobo = 100 watts / 115 volts = .87amps each mobo while steady on
> 
> 1 mobo = 150 watts / 115 volts = 1.3amps each mobo while turning on
> 
>  
> 
> I won’t include the rest of the math, but needless to say, it’d be a
> pain in arse to turn on the room in piecemeal without tripping a
> circuit breaker. My questions is :
> 
>  
> 
> Will a heavy duty UPS aid in getting me through powering up the room?
> I don’t mind splitting up the 18 machines with 6 outlet surge strips.
> Any advice?
> 
>  
> 
> Thanks.
> 
> Alpay Kasal
> 
>  
> 
> 
> _______________________________________________
> Beowulf mailing list, Beowulf at beowulf.org
> To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf

_______________________________________________
Beowulf mailing list, Beowulf at beowulf.org
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf



More information about the Beowulf mailing list