[Beowulf] Opteron downrates DDR400 to DDR333 performance?
lindahl at pathscale.com
Sat Feb 4 18:52:08 EST 2006
On Sat, Feb 04, 2006 at 12:51:46PM -0500, Mark Hahn wrote:
> well, FBdimms maintain a high clock, but stretch latency quite a bit as
> you add devices. and that's some distance off, I think - rumor has it
> that AMD is close to shipping DDR2 support.
FBdimms are great for having a of devices on a single channel and they
reduce the pin count which allows more channels, but they're bad for latency.
I don't think anyone outside of AMD has any idea when Rev F Opterons
will ship -- those are the ones with DDR2 support. However there is a
new trick with Rev E Opterons that improves memory performance, if you
look at recent SPEC submissions you'll note a large improvement (~
10%, if I recall correctly).
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