Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 93.38

+2.2%

Jan 9 9:30 AM EST

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To: Tenchusatsu who wrote (48964)	8/4/2000 5:39:17 PM
From: charred water	Read Replies (2) of 93625

Tenchusatsu, re: core latency In this case, average latency is highly dependent on core latency, where PC133-based chipsets do very well The chipset may be more optimized, since it is a 'nth' generation chipset for SDRAM, compared to a 1st generation chipset for RDRAM in the 820. However, the main latency discrepancy is probably that the chipset is benchmarked with the top binsplit of PC133, that is 2-2-2 which has 15ns tRCD and 15ns tCAC. The PC133 that is apparently shipped with all the OEM boxes is 3-3-3, which has roughly 150% more latency. The RDRAMs shipped with systems have the equivalent of 22.5 ns tRCD and 24ns tCAC. Nothing prevents faster cores from being used with RDRAMs, but it appears that the bulk of production for SDRAMs and RDRAMs do not yet meet these core speeds. A more apples-to-apples comparison of the 815 and the 820 would use PC133 3-3-3 SDRAM, representing the systems that are actually being shipped. It is true that knowledgable PC users can obtain the pc133 2-2-2 parts for a small premium. It is unlikely that the majority of consumers would do this.

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