Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 98.83

+0.8%

Dec 4 3:59 PM EST

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To: Jdaasoc who wrote (56477)	10/4/2000 1:15:19 AM
From: Bilow	Read Replies (2) of 93625

Hi Jdaasoc; Re repeater latency... This is in addition to the nanosecond or two required for propagation delay down the wires. By the way, even Intel doesn't suggest that their i840 is a great solution for a typical desktop system: The Intel® 840 chipset was specifically designed to meet the needs of high performance multi-processor systems. developer.intel.com Anyway, here's a link to the Intel notes on the RDRAM channel repeater: Product Features 6 rclk round trip delay for RSL signals throught he MRH-R (page 7 of 52) (Also see Max Memory support on page 9) developer.intel.com With PC800, an rclk is 1.25ns, so the latency penalty is 7.5ns, but for i840s going out with slower memory the latency is proportionately longer. This may seem like a lot of time, but actually, this amounts to under 2ns to get on and off the chip, each way. I think that's stunningly good performance for a repeater, but the result is comparable to the effect of registering DDR. -- Carl

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