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Technology Stocks : Rambus (RMBS) - Eagle or Penguin -- Ignore unavailable to you. Want to Upgrade?

To: Dan3 who wrote (43962)	6/10/2000 6:16:00 PM
From: Bilow	Read Replies (1) \| Respond to of 93625

Hi Dan3; Actually, what I showed was that the total PCB signal width of an RDRAM channel was wider than the total PCB signal width of a PC133 SDRAM channel. You really can't generalize that to DDR vs RDRAM, or even to the problem of comparing two SDRAM to two RDRAM channels. My guess is that DDR and RDRAM are comparable in overall signal width. But DDR will have a slightly more difficult escape problem at the controller, and that could cause an increase in the number of required signal layers. This is the only technical advantage I can find for RDRAM vs DDR with respect to motherboard PCB design issues. Of course there are plenty of issues where DDR is clearly superior to RDRAM in motherboard PCB design, and there are plenty of other areas where the technologies differ in difficulty. -- Carl

To: Dan3 who wrote (43962)	6/12/2000 3:16:00 AM
From: Dave B	Respond to of 93625

DDR 266 supports a 2.1 GB data rate compared to Rambus 800 supporting a 1.6 GB data rate. Since Carl has now pointed out the astounding fact that it will be as easy or easier to fit 2 DDR channels on a motherboard instead of 2 Rambus channels, the question becomes: at what speed does Rambus begin to show its insufficient data rate weakness. You must have missed the discussion that pointed out that DDR has a maximum throughput rate of about 65% of its theoretical maximum, or about 1.4GBs for DDR266 (or about 1.06GBs for DDR 200). RDRAM, on the other hand, can hit about 95% of their theoretical maximum, or about 1.52GBs. Scumbria, I believe it was you who asked why this was an important question. It was precisely to answer these kinds of uninformed posts. Dave