Author: Anthony Cozzie
Date: 07:20:36 06/15/04
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On June 15, 2004 at 03:34:18, Russell Reagan wrote: >On June 15, 2004 at 02:34:57, Aaron Gordon wrote: > >>#1: Athlon FX 939 pin (low latency DDR, non-registered/non-ECC memory) >>#2: Athlon 64 754 pin (same ram as 939) >>#3: Opteron / Athlon FX 940 pin (registered+ECC, higher latency) >>#4: Centrino (souped up Pentium 3) >>#5: Athlon XP / MP (Tbred/Barton cores) >>#6: Pentium 3 (Coppermine/Tualatin) / Xeon (P3 core) >>#7: Pentium 4 (Northwood) / Xeon (P4 core) >>#8: Pentium 4 (Prescott, runs about 20% slower than Northwood at chess per MHz) > >I'm not quite as familiar with the subtleties of these setups as you are, so I >have a question. Is the situation that the Athlon FX and Athlon 64 can use lower >latency memory, while the Opteron requires higher latency memory? If this is the >case, why is this the case? Does it have to do with the multiprocessing >capabilities of the Opteron? Opteron uses registered memory. This means there is a buffer between the memory and the CPU. This gives a (small) constant slowdown, but it also means greater reliability and better scaling as the number of memory banks increases. anthony
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