Fully-buffered DIMMs (FB-DIMMs) – Usually used as main memory in systems that require large capacities, such as servers and workstations.Commands go directly from the memory controller residing in the CPU to the memory module. Although they run faster and cost less, UDIMMs aren’t as stable as registered memory. Unbuffered DIMMs (UDIMMs) - Used mainly on desktop and laptop computers.The most common standard DIMMs, with a typical length of 5.5 inches and height of 1.18 inches, are: This was made worse by the fact that DIMMs based on DDR4 RAM chips can be produced in capacities up to 64 GB.Ĭooling structures on the DIMM help vent that heat into the computer enclosure and away from the motherboard and CPU. The increase in chip density in typical 8 GB or 16 GB DIMMS, and the increase in clock speed, led to an increase in heat production. As clock speeds of the RAM chips increased, the 64-bit path handled increasing amounts of data.Īnother evolution in DIMMs is the use of cooling fins or structures attached directly to the DIMM. Modern DIMMs based on double data rate fourth generation (DDR4) SDRAM chips use 288-pin connectors to attach to the computer motherboard to enable the increase in data throughput. Originally, a DIMM had a 168-pin connector to support 64-bit data transfer.Īs faster dynamic random access memory ( DRAM) was developed, DIMM circuit boards evolved. For synchronous dynamic RAM ( SDRAM) chips, which have a 64 data bit connection to the computer, SIMMs must be installed in in-line pairs, since each one supports a 32-bit path. DIMMs are typically used in desktop PCs, laptops, printers and other devices.Ī SIMM (single in-line memory module) typically has a 32 data bit (36 bits counting parity bits) path to the computer that requires a 72-pin connector. DIMMs use a 64-bit data path, since processors used in personal computers have a 64-bit data width. The DIMM stores each data bit in a separate memory cell. DIMM is a module that contains one or several random access memory ( RAM) chips on a small circuit board with pins that connect it to the computer motherboard. DIMM (dual in-line memory module) is a type of computer memory that is natively 64 bits, enabling fast data transfer.
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