SDRAM : Computer Hardware Buyers’ Glossary

by Roedy Green ©1997-2008 Canadian Mind Products
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SDRAM: Synchronous Dynamic Random Access Memory is very high speed RAM, 100 up to 200 MHz, the higher the number the faster. Technically it is synchronous memory that works in sync with the system bus, thereby avoiding wait states. It also has an on-chip burst facility. The most common kind of SDRAM has 168 pins. The pins are in three groups, 20, 60, 88. There is a notch between the groups. Depending on how the notches are offset, you can tell what kind of SDRAM you have. If the notch between the 20 and 60 is offset left, you have RFU memory, centred: buffered, offset right: unbuffered. If the notch between the 60 and 88 is offset left, you have 5 volt memory, centred: 3.3 volt. These notches prevent you from installing the wrong kind. SDRAM DIMMs are now the prevailing memory architecture, edging out EDO RAM.
DDR-SDRAM

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