[Beowulf] power supply/chassis for Opteron-based node
seth at integratedsolutions.org
Wed Jul 12 13:10:42 PDT 2006
> -----Original Message-----
> From: beowulf-bounces at beowulf.org
> [mailto:beowulf-bounces at beowulf.org] On Behalf Of Vincent Diepeveen
> Sent: Wednesday, July 12, 2006 12:29 PM
> To: Mikhail Kuzminsky; beowulf at beowulf.org
> Subject: Re: [Beowulf] power supply/chassis for Opteron-based node
> 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).
> ----- 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
We have built many linux clusters based on Opterons.
1) You will need a power supply that has greater than 20 amps of +12
This is the part of the power supply that is used to run the 2 or
3 or 4 phase
CPU on board power converter and the motor in the disk drives.
This is the main limiting factor in most power supplies
We just finished qualifying a 500 Watt PS/2 power supply that
very inexpensively. It has an internal 120mm fan and no rear
fan so its
fairly quiet. This supply only costs ~60.00 but it has a +12
volt rating of
29 amps -> 14 amps on +12 #1 and 15 amps on +12 #2. This
works excellently and has capacity to spare.
We have tried many supplies of differing power ratings but
pick them based
on the +12 volt current ratings to make sure we can supply the
and the disks with enough +12 volts. (Disk spin up uses a lot
of +12 volts)
We can put 500 watt "Server" (large 12 volt output) PS's into
from a 1U on up in size. The key is the +12 volt design part
of the supply.
2) If you are going to be using an Opteron 248 you might want to use
DDR-400 RECC memory.
This will allow the CPU to "talk" to memory at its full speed.
Opteron 246's and up will talk to
memory at DDR-400 speeds.
3) A "Cheap Chenbro Chassis" will be fine if you have good
heatsink/fan assemblies and
plenty of air flow through the chassis to keep the internal
We use all copper side-draft HSF's to make sure the CPU heat
towards the exhaust fans and not down towards the motherboard.
We use Artic
Silver 5 HSF thermal compound for good HSF to CPU
conductivity. Plus we
only use motherboards that are supported by lm sensors so that
we can test
and burn-in our systems under full load and monitor the CPU
temperatures during and after burn-in.
If you have more chassis / power supply / cooling questions email me
directly or call me.
Hope this helps........
Integrated Solutions and Systems
1510 Old North Gate Road
Colorado Springs, CO 80921
Failure can not cope with knowledge and perseverance!
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