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RDRAM Rambus Dynamic Random Access Memory. Rambus Dynamic Random Access Memory, RDRAM was developed by Rambus and first became available to computers in 1999. RDRAM is a memory technology that offers a 1.6 GB/s of theoretical memory bandwidth and offers improved memory access at a slightly higher cost when compared to SDRAM. After Intel's contract with Rambus expired in 2001, Intel shifted its focus primarily to DDR SDRAM and today, RDRAM is not often found in computers.
DDR Double Data Rate.It is double the speed of the SDRAM (the older synchronous DRAM) and is the fastest standard 168-pin DIMM (Dual Inline Memory Module) available. DDR memory modules are commonly used in Pentuum 4 and Athon compurters that run Windows XP. They are usually assigned a speed rating as part of their name, i.e. DDR266 or PC2100 for the 133 MHz version and DDR333 or PC2700 for the 166 MHz version. DDR memory modules have on notch on the connector and two notches on each side of the module.
SDRAM Synchronous Dynamic Random Access Memory. Sometimes called SyncDRAM and is in a standard 168-pin DIMM. These modules are standard memory modules on most Pentium III and some of the first Pentium 4 machines. SDRAM has access speeds of 133 MHz and have two notches in the bottom and only one notch on each side.
EDO Extended Data Output memory. This memory was used on the earlier pentium boards. It is in the form of 72 pin SIMMs (Single Inline Memory Modules). SIMMs should be added in pairs.


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