[Beowulf] Opteron downrates DDR400 to DDR333 performance?

Bruce Allen ballen at gravity.phys.uwm.edu
Mon Feb 6 10:23:59 EST 2006


Hi Mark,

> according to the chart in the AMD doc, if you already have two 2-rank dimms
> installed, further dimms need to be single-rank dimms to stay at ddr400.
> the wording of the doc makes it seem like this is actually up to the board
> vendor, though - how they configure the memory controller in bios.
> it is, after all, one of those cases where faster is by definition closer
> to the point of failure.  what actually happens depends on the bios.

I'd be grateful for a pointer (URL + page number) to the chart in the AMD 
doc.  I apologize if you have already circulated this -- I didn't realize 
the relevance of the thread until rather late.

Cheers,
 	Bruce
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