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 ?
Some more specific topics round out the book, including the reliability of eyewitness testimony, prospective memory, memory in childhood and aging, types of memory failure beyond normal forgetting processes, and memory improvement techniques.
Tenders are invited for Supply of Different types of memory cards (pen drive 8 GB, 1 GBSD card, camera card), Blu-Ray drive and player, Dipole antenna + Dish antenna, Mobile phone (different models) at least one 3 G mobile(android) Samsung/Nokia/Sony/HTC 1.
People routinely use both types of memory every day - recalling where we parked today or learning how a colleague prefers to be addressed.
The tests included word and number problems to measure different types of memory and mental flexibility.
Vaughn wondered whether practice testing might boost other types of memory too.
A new study has linked certain types of memory difficulties with increased risk for a brain-damaging stroke.
The proposed transaction will result only in vertical effects with regard to two types of memory semiconductors: Dynamic Random Access memory semiconductor chips (DRAM) and flash memories.
Takes all types of memory card and has a 512MB built in.
episodic memory, flashbulb memory, verbal memory, and so many other types of memory which are intended to describe the memory processes.
Both types of memory modules are designed with enhancements to the JEDEC standard, including reduced module height and densities up to 4 GB.
Previous research had shown that other types of memory tasks activate brain areas outside the hippocampus, the researchers note.
a provider of information technology (IT) services and solutions to federal government organizations, announced recently that it has been awarded a new blanket purchase agreement (BPA) for the Integrated Card Production System (ICPS) contract to produce various types of memory identification cards and secure identification documents on behalf of the DHS/BCIS (formerly INS).