memory module

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memory module

A narrow printed circuit board that holds memory chips (RAM chips). The common architecture for desktop computers is the dual in-line memory module (DIMM). Because of space limitations, laptops use small outline DIMMs (SODIMMs). The modules have notches in different places so that they cannot be inserted into the wrong slots (see illustration below).

Error Detection and Correction
Many computers use 8-bit RAM chips, while others use 9-bit chips. The ninth bit is a parity bit for detecting errors. High-end servers and workstations may use error-correcting memory (ECC) and registered DIMMs (RDIMMs). See ECC memory and RDIMM.

Upgrading Memory - Read the Manual (RTFM!)
A single DIMM can often be used, but pairs of DIMMs increase performance in machines that support dual channel DDR SDRAM. When upgrading memory, read the motherboard manual to find out which module combinations can be used. See SDRAM, memory types, memory card and Hybrid Memory Cube.

DIMM Modules
DIMMs are used in desktop and servers; laptops use SODIMMs. For identification, the notches between the pins are standard. However, the way chips are placed on the module is up to the manufacturer.

Earlier Modules
RIMM (Rambus) and SIMM modules are no longer used. See RDRAM.

Desktop Memory (DIMMs)
To change memory in desktop computers, you have to open the cabinet. Two of the three DIMM slots on this Mac motherboard are empty.

Laptop Memory (SODIMMs)
To change laptop RAM, a cover plate on the bottom of the unit typically has to be unscrewed.

Two Sticks of Memory
RAM modules are often called "sticks" because they are housed on long, thin circuit boards.
References in periodicals archive ?
This press release contains forward-looking statements regarding the production of Micron's new DDR2 and DDR3 Aspen Memory modules.
Nasdaq:STAK), a world-leading provider of intellectual property and services for next-generation, chip-stacking and module technologies for high-speed, high-capacity systems, announced the first ArctiCore(TM) memory module that utilizes 72 standard memory devices in an industry-standard module form factor.
We have established a track record of leadership in technological firsts and we will continue down the path of innovation in high density memory modules for the server market," said Brian Shirley, vice president of Micron's memory group.
This program is designed to certify PC133 memory modules across multiple platforms.
Computer Memory Test Labs is a leading independent memory module testing laboratory that performs motherboard compatibility testing and certification for memory module vendors in the computer industry.
SLI-Ready Memory Modules Provide Hassle-Free Performance Boost in One Setting
The qualified memory module list will be posted on CMTL's website in a format that will allow memory customers to search by memory vendor and configuration.
has announced the availability of the industry first low profile 512 MB SDRAM SO-DIMM memory module for Apple's new Powerbook G4 400/500 Mhz [Titanium].
July 19 /PRNewswire/ -- CMTL(TM) (Computer Memory Test Labs) and VIA Technologies have jointly developed a memory module compatibility/performance certification program for VIA Technologies chipset customers and memory module vendors.
MERIDIAN, Idaho & GLASGOW, Scotland -- Crucial Technology today unveiled a sleek new Crucial[R] Ballistix[R] and Ballistix Tracer[TM] memory module redesign.
the world leader in advanced memory technology, today announced sample production of the next-generation memory module for servers and workstations - a fully buffered, dual in-line memory module (FB DIMM) based on DDR2 technology.