Hello Ross,
thanks for deep analysis ! So let's see what answer/solution will be
offered to Jodi.
Regarding to me I definitely decided not to go over 3 x GTX 580 (3GB) using
common (one socket) motherboard (like mentioned "Asus P6T7 WS
SuperComputer").
I will also buy some 1400W or 1500W PSU (even for "just" 3 x GTX 580) to
ensure
safe/long-term functioning of these machines.
Best wishes,
Marek
Dne Sun, 18 Sep 2011 02:01:49 +0200 Ross Walker <ross.rosswalker.co.uk>
napsal/-a:
> Hi Marek,
>
>> However I would assume that insufficient PSU will cause just GPUs/CPU
>> errors but not
>> the melting of PSU connector ... but I am definitely not an expert
>> here.
>
> Yes BUT there should be no way an overloaded power supply would short out
> and melt the motherboard power connector. In principal it should just
> trip
> the power supply. However I suppose it is possible that either the
> current
> draw through the PCI-E slots from the 4 C2070s was too high causing a
> motherboard voltage regulator to fail and subsequently short out. This
> would
> be a fundamental design flaw in the motherboard but seems unlikely.
>
> The other possibility is the power supply was up against the limit and
> shorted in some way and put too much voltage on the motherboard power
> connector and that caused it to burn out.
>
> Either way it is simply not a failure that should be possible even if the
> power supply got overloaded. But then one only has to look at San Diego's
> power company trying to blame some lowly technician for blacking out the
> whole of southern California, Arizona and New Mexico to realize that
> everybody takes short cuts not bothering to make things fail safe.
>
> Oh well.
>
> Let's wait to see what happens when the machine comes back.
>
> BTW, people should note that all the 4 GPU boxes I have built, that are 2
> socket with 4 C2070 or 4 x M2090 and supermicro boards ALL have dual
> 1.4KW
> redundant power supplies. Trying to run 4 GPUs (4 GTX580s would be crazy)
> off a single power supply is really pushing the envelope. Especially in
> the
> US where the voltage is an appallingly low 110V so you can only get 2.2KW
> total off a single circuit. 2 x 1.4KW independent power supplies plugged
> in
> independent circuits (but sharing the same earth) is probably the correct
> way to go for building such systems. In Europe you can plug both power
> supplies in the same circuit. :-)
>
> All the best
> Ross
>
> /\
> \/
> |\oss Walker
>
> ---------------------------------------------------------
> | Assistant Research Professor |
> | San Diego Supercomputer Center |
> | Adjunct Assistant Professor |
> | Dept. of Chemistry and Biochemistry |
> | University of California San Diego |
> | NVIDIA Fellow |
> | http://www.rosswalker.co.uk | http://www.wmd-lab.org/ |
> | Tel: +1 858 822 0854 | EMail:- ross.rosswalker.co.uk |
> ---------------------------------------------------------
>
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Received on Sun Sep 18 2011 - 08:00:03 PDT
