DIMM: Memory module for desktop
DIMM, the dual inline memory modules are evolved from earlier RAM module package SIMM, the single inline memory module. The DIMM memory module gained its usage with the introduction 64 bit Pentium processor by the Intel. Earlier since, the SIMM has 32 bit wide path required installation of SIMM in matched pair to complete the bus width of 64 bit. The DIMM comes in several sizes. SDRAM the Single Data Rate (SDR) SDRAM DIMMs comes in two sizes of 1.7-inch and 1.5-inch.
These DIMM get easily placed in sockets of desktop computer motherboard as sufficient space in general is available in desktop computer. However, with the introduction slim rack mount servers and to facilitate plugging of DIMM modules in the 1.75″ high box, the DDR DIMMs were standardized with height of 1.2″. These DIMMs are called low profile DIMM and get easily accommodated in memory sockets for a 1U server. The requirement for even smaller DIMM assumed importance with blade servers gaining its footage in the market.
Earlier developed LP DIMMs are angled to place in space-constrained blade server boxes but this has generated need for development of DIMM with a height of 0.72″. These DIMMs are also known as Very Low Profile DIMM or VLP DIMM. With further evolution in SDRAM memory techniques, JEDEC has specified VLP DIMM with 18.75mm height for DDR3 type DIMM modules. The DDR2 and DDR3 types of DIMM since operates at lower voltage than SDRAM modules, therefore they are better power consumption characteristics.
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