DIMM, an abbreviation for dual in-line memory module, is a collection of RAM (Random Access Memory) modules mounted on a printed circuit board. These are made to be used with desktop/laptop computers, servers, and workstations.

Originally, SIMM (single in-line memory modules) were predominantly in use. However, DIMM have began to replace SIMM in terms of overall usage. One difference between single and dual in-line memory modules is that SIMM use a 32 bit data path, whereas DIMM utilize a 64 bit path. Because Intel’s Pentium processors use a 64 bit bus width, it makes since to use DIMM as opposed to SIMM. Because Intel processors are so popular, DIMM can be considered the best choice for the job.

There are two different types of DIMM:

• SDRAM - This module contains 168 pins, and has two notches on the bottom of the board.
• DDR SDRAM - This one uses 184 pins and instead only has notch on the bottom of the board.

These notches are used to make sure that the installation process is foolproof so that the user doesn’t accidentally install an type of RAM that’s incompatible with the motherboard. In SDRAM, the first notch is the DRAM key position, and the second is the voltage key. DDR SDRAMs are just arranged slightly different.

Not only are there DDR SDRAMs, but DDR2 and DDR3 SDRAMs also exist. These operate at different speeds, which are measured in MHz. DDR SDRAM ranges from about 200 to 400 MHz, whereas DDR3 types range anywhere from 800 to 2000 MHz. As you can see, the higher the number suffix, the faster the speed.  These newer types of DDR are quickly replacing the original DDR, as the need for increased performance goes up as technology advances (well, for the most part).

Some current DIMM in use are:

• 172 pin MicroDIMM (DDR SDRAM)
• 184 pin DIMM (DDR SDRAM)
• 200 pin SO-DIMM (DDR SDRAM and DDR2 SDRAM)
• 214 pin MicroDIMM (DDR2 SDRAM)
• 204 pin SO-DIMM (DDR3 SDRAM)
• 100 pin DIMM (printer SDRAM)

DIMM also support error correction. Errors can occur when electrical interference causes a single bit to randomly flip to the opposite state (0 to 1, or vice versa), and ECC capable DIMM use extra data bits in order to detect such errors. Although there are several types of methods, the most common would have to be the Single Error Correct, Double error detect, which includes an extra byte of information in every 64-bit word. These modules use an extra 9th bit to help solve the potential bit gone wrong.

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