Re: [Beowulf] Opteron downrates DDR400 to DDR333 performance?

2006-02-05 Thread Mark Hahn
> http://www.valueram.com/datasheets/KVR400X72C3A_1G.pdf The specs describe hmm, not the most explicit page... > ECC memory module. The components on this module include eighteen 64M x > 8-bit (16M x 8-bit x 4 Bank) DDR400 SDRAM in TSOP packages. The my understanding is that the "ranks" (som

Re: [Beowulf] Opteron downrates DDR400 to DDR333 performance?

2006-02-05 Thread Bruce Allen
perhaps this is TMI, but the answer depends on which cpu rev you're using (and whether the bios optimizes the memory controller.) the AMD bios-writers doc cited earlier shows that 4 dimms (2xdouble, 2xsingle) can still be used at ddr400 on rev e. no config uses >6 CS's at DDR400, and some drop