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To increase memory capacity and bandwidth, chips are combined on a module. For instance, the 64-bit data bus for DIMM requires eight 8-bit chips, addressed in parallel. Multiple chips with common address lines are called a memory rank. The term was introduced to avoid confusion with chip internal rows and banks. A memory module may bear more ...
A DIMM (Dual In-Line Memory Module) is a popular type of memory module used in computers. It is a printed circuit board with one or both sides (front and back) holding DRAM chips and pins . [ 1 ] The vast majority of DIMMs are manufactured in compliance with JEDEC memory standards , although there are proprietary DIMMs.
Types of memory module include: TransFlash Memory Module; SIMM, a single in-line memory module; DIMM, dual in-line memory module Rambus memory modules are a subset of DIMMs, but are normally referred to as RIMMs; SO-DIMM, small outline DIMM, a smaller version of the DIMM, used in laptops; Compression Attached Memory Module, thinner than SO-DIMM
Some measurements of modules are size, width, speed, and latency. A memory module consists of a multiple of the memory chips to equal the desired module width. So a 32-bit SIMM module could be composed of four 8-bit wide (×8) chips. As noted in the memory channel part, one physical module can be made up of one or more logical ranks.
SDRAM memory module, zoomed. As an example, a 512 MB SDRAM DIMM (which contains 512 MB), might be made of eight or nine SDRAM chips, each containing 512 Mbit of storage, and each one contributing 8 bits to the DIMM's 64- or 72-bit width. A typical 512 Mbit SDRAM chip internally contains four independent 16 MB memory banks. Each bank is an array ...
One 64 GiB DDR5-4800 ECC 1.1 V registered DIMM (RDIMM) Example of an unregistered DIMM (UDIMM) Registered memory (also called buffered memory) is computer memory that has a register between the DRAM modules and the system's memory controller. A registered memory module places less electrical load on a memory controller than an unregistered one.
The full memory timings of a memory module are stored inside of a module's SPD chip. On DDR3 and DDR4 DIMM modules, this chip is a PROM or EEPROM flash memory chip and contains the JEDEC-standardized timing table data format.
Fully buffered memory systems place a memory buffer device on every memory module (called an FB-DIMM when fully buffered RAM is used), which unlike traditional memory controller devices, use a serial data link to the memory controller instead of the parallel link used in previous RAM designs. This decreases the number of wires necessary to ...