# DIMM

> computer memory module that has separate electrical contacts on each side of the module and a 64-bit data path

**Wikidata**: [Q877592](https://www.wikidata.org/wiki/Q877592)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DIMM)  
**Source**: https://4ort.xyz/entity/dimm

## Summary
A DIMM (Dual In-line Memory Module) is a computer memory module consisting of a discrete printed circuit board with mounted memory chips. It is defined by having separate electrical contacts on each side of the module and providing a 64-bit data path for primary memory operations.

## Key Facts
- **Classification:** A subclass of memory module and a form of primary memory.
- **Data Path:** Features a 64-bit data path for transmitting instructions and data.
- **Physical Design:** Utilizes an edge connector to interface with a RAM slot on a motherboard.
- **Predecessor:** Historically follows the SIMM (Single In-line Memory Module) standard.
- **Internal Components:** Includes an EEPROM used for serial presence detect (SPD).
- **Variants:** Includes specialized versions such as Fully Buffered DIMM (FB-DIMM).
- **Form Factors:** Exists in smaller form factors known as SO-DIMMs for DDR, DDR2, DDR3, and DDR4 technologies.

## FAQs
### Q: What does DIMM stand for?
A: DIMM stands for Dual In-line Memory Module. The name refers to the module's design, which features independent electrical contacts on both sides of the printed circuit board.

### Q: How does a DIMM differ from a SIMM?
A: A DIMM follows the SIMM (Single In-line Memory Module) in technical evolution. Unlike the SIMM, a DIMM has separate electrical contacts on each side and utilizes a 64-bit data path.

### Q: What is the purpose of the EEPROM on a DIMM?
A: The EEPROM on a DIMM is used for serial presence detect (SPD). This allows the system to identify the memory module's specific technical characteristics and configuration.

## Why It Matters
DIMMs serve as the standard physical interface for primary memory in modern computing. By mounting memory chips onto a discrete printed circuit board with a 64-bit data path, they provide the necessary bandwidth for a computer's central memory storage to handle instructions and data efficiently. The transition to the DIMM architecture allowed for more complex electrical configurations than its predecessor, the SIMM, by utilizing both sides of the module for unique electrical contacts. Furthermore, the architecture's flexibility is demonstrated by its various iterations—from standard desktop modules to smaller SO-DIMM form factors—ensuring that high-speed primary memory can be integrated into a wide range of hardware environments.

## Notable For
- **Dual-Sided Contacts:** Unlike earlier modules, DIMMs feature separate electrical contacts on each side of the board.
- **64-Bit Architecture:** Provides a standard 64-bit data path, which is a key requirement for modern primary memory systems.
- **Serial Presence Detect (SPD):** Uses an integrated EEPROM to communicate module specifications to the computer system.
- **Standardized Connectivity:** Uses a specialized edge connector designed specifically for RAM slots.

## Body
### Technical Specifications
A DIMM is a discrete printed circuit board (PCB) that serves as a carrier for memory chips. Its primary function is to act as primary memory, which is the central storage for a computer's active instructions and data. The module is characterized by a 64-bit data path and the presence of separate electrical contacts on each side of the module's edge.

### Components and Connectivity
DIMMs interface with a computer system through a dedicated RAM slot using an edge connector. A critical component of the DIMM is an onboard EEPROM. This chip is used for serial presence detect (SPD), a process that allows the computer to automatically recognize and configure the memory module's settings.

### Evolution and Form Factors
The DIMM architecture succeeded the SIMM (Single In-line Memory Module) standard. Over time, the technology has branched into several specialized classes and form factors:
*   **SO-DIMM:** A smaller form factor of the standard DIMM, available for DDR, DDR2, DDR3, and DDR4 technologies.
*   **Fully Buffered DIMM (FB-DIMM):** A specific memory technology class designed for enhanced data management.

## Schema Markup
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## References

1. Freebase Data Dumps. 2013
2. BabelNet
3. Quora
4. KBpedia