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Subject: Re: Processor's

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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