Module naming convention and peak bandwidth

TIM

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Module naming convention and peak bandwidth

Table 2 summarizes the various types of DDR-1, DDR-2, and DDR-3 SDRAM and their associated naming conventions. Originally, the module naming convention for DDR-SDRAM was based on the effective clock rate of the data transfer: PC200 for DDR SDRAM that operates at 100 MHz; PC266 for 133 MHz; and so forth. However, due to confusion over the Rambus naming convention the industry based the DDR-SDRAM naming convention on the actual peak data transfer rate in MB/s. For example, PC266 is equivalent to PC2100 (64 bit * 2 * 133 MHz = 2.1 GB/s or 2100 MB/s).

Manufacturers of DDR-3 SDRAM DIMMs are producing two types of DIMMs: Unbuffered DIMMs (UDIMM) and Registered DIMMs (RDIMM). UDIMMs represent the most basic type of memory module and offer lower latency and (relatively) low power consumption but are limited in capacity. Unbuffered DIMMs with ECC are identified with an E suffix in the manufacturer’s module name (example PC3-8500E). UDIMMs are applicable for systems with low DIMM counts and where large memory capacities are not required.

RDIMMs offer larger capacities than UDIMMs and include address parity protection. Registered DIMMs are identified with an R suffix in the module manufacturer’s name (example PC3-8500R).

Information porvided by Hewlett-Packard Development Company, L.P.