Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 87.63

-3.9%

3:59 PM EST

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To: C_Johnson who wrote (25851)	7/28/1999 4:47:00 PM
From: Ian Anderson	Read Replies (1) of 93625

Carl I believe your comments on the performance of RDRAM are extremely misleading. There is a detailed analysis of the most common memory operation in PCs, fetching 32 bytes of data to the cache after a cache miss, at usa.samsungsemi.com This shows that this operation takes PC100 90nS PC133 75nS Rambus 70ns So Rambus is ahead by a nose on PC133 on the first operation. What they don't go on to show in this paper is what happens when the next cache line is fetched. For PC100, and PC133, you have to send the column address again, so the next line takes the same time as the first. Rambus on the other hand does not need to send the address again. In fact it overlaps the next memory read with the data transfer of the previous data, so the next data is ready to clock out 20ns after the previous transfer ends, and transferring the data takes 18.75ns so the next 32 bytes takes PC100 90ns PS133 75ns Rambus 38.75ns Rambus can sustain very close to double the throughput of PC133! A 100% improvement will be available in Q3 with the Carmel chipset which supports two Rambus channels. You can't do that with PC133. There is scope for a further 100% improvement if the speed of the RAM core is improved with smaller process geometry. Please don't confuse the market with your half baked research. Ian

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