History ĭIMMs (Dual In-line Memory Module) were a 1990s upgrade for SIMMs (Single In-line Memory Modules) as Intel P5-based Pentium processors began to gain market share. DIMMs come in a variety of speeds and sizes, but generally are one of two lengths - PC which are 133.35 mm (5.25 in) and laptop ( SO-DIMM) which are about half the size at 67.60 mm (2.66 in).
The vast majority of DIMMs are standardized through JEDEC standards, although there are proprietary DIMMs. DIMMs are the predominant method for adding memory into a computer system. A DIMM comprises a series of dynamic random-access memory integrated circuits that are mounted to its circuit board. A DIMM is often called a 'RAM stick' due to its shape and size. It is a circuit board that contains memory chips and connects to the computer's motherboard. Three SDRAM DIMM slots on a ABIT BP6 computer motherboardĪ DIMM, or Dual In-Line Memory Module, is a type of computer memory module used in desktop, laptop, and server computers. Also, each module has eight RAM chips, but the lower one has an unoccupied space for the ninth chip this space is occupied in ECC DIMMs. The SDRAM module has two notches (rectangular cuts or incisions) on the bottom edge, while the DDR1 SDRAM module has one. Computer memory module Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin DDR SDRAM module (bottom).
