Okee, het was natuurlijk al langer bekend dat AMD tot het PC133 / DDR SDRAM broederschap behoorde. In tegenstelling tot Rambus DRAM hebben we over DDR SDRAM eigenlijk niet veel gehoord. Techweb heeft een artikeltje met info:
Advanced Micro Devices will lean heavily on PC133 and double-data rate synchronous DRAM to boost the performance of its new Athlon processors, putting Rambus memory on the back burner due to its high initial cost and the comparable performance of SDRAM-based memory, the company said.
"We've been talking about Rambus a long time, and it was looking like it would be the foremost architecture," said Samuel Rogan, AMD's marketing manager for Japan and South Korea. "There will be a time when that will happen, but probably not until the end of 2000 or 2001."
[...] During its presentation on the Athlon processor in Tokyo, AMD showed a slide indicating that 100-MHz DDR SDRAM with a standard64-bit memory bus will provide 1.6 gigabytes per second of bandwidth, equal to a 400-MHz (800-MHz effective) Rambus DRAM running on Rambus' proprietary 16-bit serial bus. DDR SDRAMs with a core frequency of 133 MHz (266-MHz effective) will ratchet up memory bandwidth to 2.1 Gbytes/s, according to the company.
"Rambus boasts higher frequency on data transfers, but because of the narrower pipe they do not get the same data throughput as you do with DDR," Rogan said. "Since DDR has comparable or better performance than a Rambus solution at a better cost, the motherboard guys like it and the DRAM manufacturers don't have to retool."
[...] As for DDR chip sets, AMD's Rogan said he expects the first to be available by early next year. DRAM vendors have been sampling DDR SDRAMs for several years, and are gearing up to make the shift to so-called PC266 DRAMs, which are DDR SDRAMs with a core frequency of 133-MHz that transfer data on both the rising and falling edge of the clock.