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

To: richard surckla who wrote (24079)	7/2/1999 1:39:00 AM
From: Scumbria	Read Replies (2) \| Respond to of 93625

Richard, The posting you provided I would generally agree with. I don't think the author is as enthusiastic as I about the possibilities for multi-channel DRDRAM. For high performance graphics designs, DRDRAM provides the only practical solution. Scumbria

To: richard surckla who wrote (24079)	7/2/1999 12:27:00 PM
From: J_W	Respond to of 93625

Richard, One error in their post. The Rambus channel runs at 400MHz not 800 MHZ. Data is transferred on both the leading and trailing edge of the clock or two transfers per clock cycle. Thus the effective data rate is 800MHz, but the actual clock runs at 400MHz. The Rambus channel itself only runs between the memory controller and the RIMM modules, so you will not have this bus running all over the motherboard. In fact this bus is and must be kept short. The challenge for motherboard designers will be to keep the electrical characteristics of the Rambus channel to spec for a high speed, controlled impedance, matched transmission line bus. Regards, Jim <The only advantage to D-RDRAM would be to pack more channels on the same motherboard real estate. D-RDRAM is a low signal swing differential 16 bit bus and thus requiring 32 lines as opposed to the 64 (+lots of ground) of the PC133 DRAM. However board layout @ 800MHz is VERY challenging. The D-RDRAM probably has an edge in bandwidth but inferior latency as compared to PC133. It will be interesting to see how double data rated PCxxx DRAMs will perform. That is if the challenges in board layout will compromise the performance (bandwidth).>