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SDRAM Module Types

The following types of DRAM modules can be found in computers and notebooks: SIMMs, RIMMs, DIMMs and SODIMMs.
 
The differences between these module types are:
  • SIMM = Single Inline Memory Module - The pins of the modules are located on both sides the PCB-board, but each front pin has a contact with a back pin (through contact holes), so that both receive the same signal.

  • DIMM = Dual Inline Memory Module - The pins of the modules are located on both sides the PCB-board, but the pins from the front do not contact with those on the back side, so that each receives a different signal.
  • RIMM = Rambus inline memory modules - These modules are similar to DIMMs, but the PCB-boards are optimized for high speed Rambus-applications.
  • SODIMM = Small Outline Dual Inline Memory Module - It is a smaller DIMM
    with smaller contact pins. It is used in notebooks, where space is a critical parameter.

Here you can find some photos of DRAM modules.