It is the higher-speed successor to DDR, DDR2 and DDR3. As of August, 2014, DDR4 SDRAM is a modern emerging type of dynamic random access memory (DRAM) with a high-bandwidth ("double data rate") interface, and has been in use since 2013. 288-pin DIMM, used for DDR4 SDRAM and DDR5 SDRAM ĭDR, DDR2, DDR3, DDR4 and DDR5 all have different pin counts and/or different notch positions.278-pin DIMM, used for HP high density SDRAM.260-pin SO-DIMM, with different notch position than on DDR4 SO-DIMMs, used for UniDIMMs that can carry either DDR3 or DDR4 SDRAM.240-pin DIMM, used for DDR2 SDRAM, DDR3 SDRAM and FB-DIMM DRAM.200-pin DIMM, used for FPM/EDO DRAM in some Sun workstations and servers.200-pin SO-DIMM, used for DDR SDRAM and DDR2 SDRAM.168-pin DIMM, used for SDR SDRAM (less frequently for FPM/EDO DRAM in workstations/servers, may be 3.3 or 5 V).144-pin SO-DIMM, used for SDR SDRAM (less frequently for DDR2 SDRAM).72-pin SO-DIMM (not the same as a 72-pin SIMM), used for FPM DRAM and EDO DRAM.
Variants of DIMMs support DDR, DDR2, DDR3, DDR4 and DDR5 RAM.Ĭommon types of DIMMs include the following: Many enhancements have occurred to the modules in the intervening years, but the word "DIMM" has remained as a generic term for computer memory modules. The name "DIMM" was chosen as an acronym for Dual In-line Memory Module symbolizing the split in the contacts of a SIMM into two independent rows.
This allowed them to double the SIMMs 32-bit data path into a 64-bit data path. The contacts on SIMMs on both sides are redundant, while DIMMs have separate electrical contacts on each side of the module. The processor would then access the two SIMMs in parallel.ĭIMMs were introduced to eliminate this disadvantage. The Pentium had a 64-bit bus width, which would require SIMMs installed in matched pairs in order to populate the data bus.
Memory dim3 upgrade#
DIMMs (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.
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