[Beowulf] X5500 - ECC Registered or Unbuffered?
jlb17 at duke.edu
Wed Apr 1 21:44:53 PDT 2009
On Wed, 1 Apr 2009 at 4:47pm, Orion Poplawski wrote
> Jan Heichler wrote:
>> Don't forget DDR3-ECC memory which must be registered.
> http://www.siliconmechanics.com/i22789/2U-4-node-server.php shows options for
> "ECC Unbuffered" or "ECC Registered". No idea what the practical difference
> would be. Anyone?
AFAIK, the only difference is available capacity (well, and price of
course). You can't get unbuffered DIMMs bigger than 2GB. Also note that
memory speed goes down as you add more DIMMs per channel (it's also a
function of CPU clock speed). So if you want a fair bit of memory (read,
more than 12GB) but also want to run it as fast as possible, you'll need
to buy Registered DIMMs (and a fast enough CPU).
QB3 Shared Cluster Sysadmin
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