[Beowulf] power supply/chassis for Opteron-based node

Vincent Diepeveen diep at xs4all.nl
Wed Jul 12 11:29:28 PDT 2006

Mikhail, not so much the wattage that the power supply claims it has in 
total is what you're interested in,
as well as the wattage that it delivers effectively over the rails in use 
(+12V,+5V etc).

It's here where the manufacturer of the mainboard will typically specify 
what is needed for their mainboard.

I'm using myself a 680W thermaltake power supply.

In your case probably the question will be whether you will upgrade one day 
to dual core opterons.
Those are like 110 watt a chip right now, add whatever else you've got in 
the machine and 20% loss to it.

I'm guessing that i'm using effectively 480 watt nonstop here with i/o 
working hard.

Not sure what that mellanox card is eating, but it probably won't be little, 
and it'll never idle.

500 watt sounds like some sort of minimum that you need from a decent power 
supply, not a $20 one.

----- Original Message ----- 
From: "Mikhail Kuzminsky" <kus at free.net>
To: <beowulf at beowulf.org>
Sent: Wednesday, July 12, 2006 4:19 PM
Subject: [Beowulf] power supply/chassis for Opteron-based node

>I looked to reccomendation of power supply/rackmount chassis for Supermicro 
>and Tyan dual Opteron motherboards based on nVidia Prof. 2200/2050 chipsets 
>(for example, Supermicro H8DCE-B). The recommended power for power supply 
>is about 650 W (or higher), what looks as too high for our conditions.
> We will use 2 or 4 GB DDR333, 2*Opteron 248, 1 x HDD 10000 RPM, 1 x 
> Infiniband DDR (Mellanox) HCA per node (plus minimal PCI graphic card,
> &CDROM). Currently (w/AMD chipset, for 2 x Opteron 244) we work w/cheap 
> Chenbro chassis (4U) having only 420 W power supply.
> I understand that it's possible to calculate relative exactly the power 
> requirements (ampers for each voltage levels), from TDP etc, but:
> what is typical power of power supply used "here" - by beowulf community 
> members - for close configuration of nodes (not 1U)? BTW, what is good 
> cheap chassis alternative for Chenbro - AIC/T-Win ? what else ?
> Yours
> Mikhail Kuzminsky
> Zelinsky Institute of Organic Chemistry
> Moscow
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