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), which transfers 64 bits at a time. Because of space limitations, laptops use small outline DIMMs (SODIMMs). The modules are keyed with notches in different places so they cannot be inserted into the wrong slots (see below). See RAM.

Error Detection and Correction
Most desktop and laptop computers use RAM chips that hold eight bits per byte, while high-end servers and workstations typically have nine bits. The ninth bit is a parity bit for detecting errors. 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 MT/sec, SDRAM, memory types, memory card and Hybrid Memory Cube.

DIMM Modules
DIMMs are used in desktop and servers; laptops use SODIMMs. The notches at the bottom of the modules designate the number of pins. 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. RIMM modules transferred data over 16-bit and 32-bit channels, whereas SIMMs were 32-bit. DIMM modules support 64-bit paths. See RDRAM.

DIMM Modules in a Desktop Machine
To change memory in desktop computers, the cabinet has to be opened. 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.
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References in periodicals archive ?
HyperX has shipped over 60 million memory modules and 5 million gaming headsets worldwide.
DDR4 memory modules will require 1.2-volts to operate compared to the higher 1.5-volts needed by existing DDR3 memory modules.
KingstonEoACAOs memory module products include branded or system-specific memory; ValueRAMEeA industry-standard memory built to JEDEC specs and designed for system integrators and white box builders; and HyperXEeA memory for gamers and PC enthusiasts who demand higher performance and speed.
Kingston's memory module products include system-specific memory; ValueRAM industry-standard memory built to JEDEC specs and designed for system integrators and white box builders; and HyperX memory for gamers and PC enthusiasts who demand higher performance and speed.
The solution supports a 204-pin, 800 MHz clock (1600 MT/s data rate), 64-bit, Un-buffered Synchronous Double Date Rate 3 DRAM Small Outline Dual In-Line Memory Module (DDR3 SDRAM SODIMM).
The market has seen the progression from double data rate (DDR) to DDR2 and now DDR3 memory modules. Simultaneously, new processors are now advertised that can communicate at increasingly greater bandwidths across the FSB to these modules.
Before ordering boards, we had to design the working panel or palette that would contain multiple individual memory module circuits.
Presentations may be saved to the Presenter-to-Go's Flash Memory, the Visor's internal memory or a Springboard Flash Memory module.
Simm stands for single inline memory module and is commonly found in 486 and Pentium computers.
Netherlands contractor Philips Semiconductors has developed the CMOS18 Flash memory module, a two-transistor cell for use in its 0.18-[micro]m complementary metal oxide semiconductor (CMOS) technology.
Every computer memory module produced is bar coded to eliminate mixups on the shop floor and in customer shipments, saving time and money for all.
Memory module choices offered by MGV include one 8Mb, 2 by 32, 70ns memory module; two 4Mb, lby 32,70ns memory modules; two 4Mb, 1 by 32 EDO,60ns memory modules.