Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 87.70

-3.8%

3:59 PM EST

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To: Ian Anderson who wrote (38773)	3/23/2000 12:54:00 PM
From: Bilow	Read Replies (1) of 93625

Re DDR being relatively slower on second accesses. Not so. Given the same peak bandwidth, a DDR system will suffer the same added delay as an RDRAM system. If the DDR has higher bandwidth, as in the Dolphin, then the DDR will have lower delay for the second (and consecutive) accesses. This, of course, assumes data read from the same page, as would be the case for the bytes of a cache line. SDRAM / DDR allow burst accesses that are designed to support cache fills with excellent efficiency. The figure to look at is peak bandwidth. That will give you how much delay the 2nd, 3rd, etc., accesses take, after taking into consideration the (actual) granularity. Example. A memory system with a peak access rate of 3.2GB/sec that outputs 16 bytes at a time. (As per certain DDR memory configurations.) Each consecutive 16 bytes read takes 16B/(3.2GB/sec) = 5ns. -- Carl

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