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To: richard surckla who wrote (44081)	6/11/2000 3:43:00 PM
From: Estephen	Read Replies (2) \| Respond to of 93625

DDR NB DIE 60% LARGER THAN RDRAM NB! READ (from yahoo) DDR IS DEAD! MUST READ! DDR NB has 60% larger die size than RDRAM NB. DDR un-buffered samples are not available today. Buffered DDR is 50% larger than un-buffered and do not fit into a PC100 envelope, making them unsuitable for DT solutions and much more expensive. quote: "This becomes a problem for DDR systems, which double the bandwidth of the data bus while the address bus bandwidth remains unchanged. With DDR it only takes 2 clocks to transfer the data, but it still takes four clocks to transfer the address. This makes the memory system address bandwidth bound, resulting in a sustainable bandwidth for a DDR system of no more than an SDRAM system. The solution is to implement single cycle addressing in the DDR system. To do this, the loading on the address lines must be decreased. This is exactly what buffered DIMMs do - they decrease the loading on the address lines by providing a register between the North Bridge and the DRAMs. This is an acceptable solution for servers, but for high performance desktop systems it is unattractive because of the increased latency due to the buffer chips, the added $15 in cost, and the 50% larger modules." dramreview.com