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Technology Stocks : Intel Corporation (INTC)

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Nov 19 3:59 PM EST

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To: Tenchusatsu who wrote (104229)	6/8/2000 3:17:00 PM
From: pgerassi	Read Replies (1) of 186894

Dear Tench: RDRAM is harder to route. It has a jitter allowance of 20ps to 40ps total between signals (PC800). This means that the traces be no more than +/- 0.6mm different in length and all have the same impedence (50 +/- 1 ohm)(even through the edge connectors). PC133 SDRAM has a jitter allowance of 500ps. This allows its trace length to be no more than +/- 7.5mm different, a much easier requirement. In a RIMM, there is more data traces than on a SDRAM. Remember that to get a 256MB RIMM requires 16 chips which, require 17 sets of channel traces. Where as SDRAM only needs one set. Thus there are far less traces in a SDRAM DIMM. Which all leads to RDRAM being harder to route when used in a PC (or server) environment. Pete

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