Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 246.76

-0.5%

Nov 14 9:30 AM EST

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To: DDB_WO who wrote (227228)	3/2/2007 1:53:03 PM
From: Ali Chen	Read Replies (2) of 275872

"One interesting comment was that Intel's current memory access latency is 100ns while AMD's is 70ns and he suggested that AMD will be at 55ns soon. I assume he was talking about K10. I'm now wondering where the improvement will come from. I wonder if this could be related to the new direct to L1 prefetch versus the older load to L2 prefetch." The attempt to reduce main memory latency is indeed a nobel move. However, as I said many times, the advantage of AMD approach to memory handling is highly exaggerated. You need to look at the overall effect of whole memory subsystem, including the art of hardware prefetch, quality of software prefetch, cache miss rates, and FSB/memory penalties. If you look even at somewhat old data, home.austin.rr.com the bottom line is that AMD already has 50-60% disadvantage in overall memory waste traffic even as compared to old Pentium D, with older chipset and slower memory, compare line (4) with lines (6) or (7). It translates into 25-30% of loss in overall performance. The data are for SPEC2000, which has smaller data sets than newer SPEC2006, so the gap must be more pronounced in 2006. But even if the AMD statement is true (100ns vs.70/55ns), which I doubt (their base might be quite obsolete), their latency effort is in right direction. - Ali

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