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  • #2314480

    Memory Types ?

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    by hw-tech ·

    Where can I find out what what memory types such as PC133. PC2100, etc are ? Such straightforward info eludes me!

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    • #3459707

      Basics

      by thechas ·

      In reply to Memory Types ?

      Kingston (www.kingston.com) has a general FAQ that gives good basic knowledge of the different memory types.

      Their are 4 types of RAM in ‘common’ usage at this time:

      72 pin SIMM

      168 pin SDRAM DIMM

      168 pin DDR RAM DIMM

      184 pin RDRAM DIMM

      Within each style, there are different types and speeds.

      SIMM types:
      FPM Fast page Mode
      Parity FPM with a parity bit
      EDO Enhanced / Extended Data Out

      SIMM speeds:
      80 ns, 70 ns, 60ns

      SDRAM DIMM speeds:
      PC66 66 MHz
      PC100 100MHz
      PC133 133MHz

      DDR Speeds:
      PC1600 160MHz
      PC2100 210MHz
      PC2600 260MHz
      PC3300 330MHz

      RDRAM speeds:
      400 MHz
      800 MHz

      Then, there are variations in the density of the memory chips on the modules.
      Many a system that uses SDRAM DIMMs has problems with the on-going evolution of the SDRAM standard.
      There are at least 3 different ‘generations’ of SDRAM. Not all motherboards can use all of the different variations.

      Chas

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