Direct Rambus DRAM (DRDRAM)

Direct Rambus DRAM (DRDRAM), often called RDRAM, is internally similar to DDR SDRAM, but uses a special method of signaling developed by the Rambus Company that allows faster clock speeds. RDRAM chips are packaged on modules called RIMMs, which are not compatible with the DIMMs used for plain SDRAM. Intel licensed the Rambus technology and introduced chipsets with RDRAM support. Early P4 systems could only use RDRAM, but as prices remained high, Intel finally introduced support for DDR. (The company VIA had a DDR chipset for the Pentium 4 before this, but legal threats put motherboard manufacturers off using it. VIA then decided to make their own boards with the chipset but these didn't gain much traction either) RDRAM all but disappeared in new systems around 2003, due to the availability of DDR chipsets for the Pentium 4 and the lower cost of SDRAM. Sony used RDRAM in its PlayStation 2 video game console, and announced it would use Rambus's XDR memory in its PlayStation 3, expected in 2006.

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