# DDR4 SO-DIMM

> smaller form factor of DDR4 DIMM

**Wikidata**: [Q107449474](https://www.wikidata.org/wiki/Q107449474)  
**Source**: https://4ort.xyz/entity/ddr4-so-dimm

## Summary
DDR4 SO-DIMM is a compact memory module that combines the smaller form factor of SO-DIMM with the fourth-generation DDR4 SDRAM standard, designed for use in space-constrained devices like laptops and tablets. It serves as a technical standard for low-profile memory solutions, offering improved performance and power efficiency compared to its DDR3 predecessor.

## Key Facts
- **Form Factor**: Smaller variant of DDR4 DIMM, optimized for compact systems.
- **Parent Standards**: Subclass of both SO-DIMM (small form factor) and DDR4 SDRAM (fourth-generation memory).
- **Predecessor**: Follows DDR3 SO-DIMM, providing enhanced speed and efficiency.
- **Technical Classification**: Instance of a technical standard; combines 64-bit data path (from DIMM) with DDR4 specifications.
- **Aliases**: Commonly referred to as DDR4 SODIMM.
- **Media**: Depicted in Wikimedia Commons categories "DDR4 RAM SO-DIMMs" with official images available.
- **Wikidata Status**: Described as "smaller form factor of DDR4 DIMM" with sitelink count of 1.

## FAQs
### Q: What is DDR4 SO-DIMM used for?
A: DDR4 SO-DIMM is used in compact computing devices such as laptops, tablets, and small form factor PCs, providing high-density memory in a space-efficient design.

### Q: How does DDR4 SO-DIMM differ from standard DDR4 DIMM?
A: DDR4 SO-DIMM has a smaller physical size compared to full-size DDR4 DIMM, allowing integration into thinner and lighter devices while maintaining similar performance capabilities.

### Q: Is DDR4 SO-DIMM backward compatible with DDR3 slots?
A: No, DDR4 SO-DIMM is not compatible with DDR3 slots due to differences in pin configuration, voltage requirements, and signaling protocols.

## Why It Matters
DDR4 SO-DIMM plays a critical role in enabling modern portable electronics by delivering the memory capacity and bandwidth required for demanding applications in a compact, power-efficient package. As a successor to DDR3 SO-DIMM, it supports lower operating voltages (1.2V vs. 1.5V for DDR3), reducing power consumption and heat generation. This standard facilitates the development of thinner, lighter devices without compromising performance, aligning with the evolution of mobile computing and IoT technologies. Its adoption reflects the industry shift toward energy-efficient, high-density memory solutions tailored for small form factor systems.

## Notable For
- **Compact Design**: Smaller than full-size DDR4 DIMM, enabling use in ultra-thin laptops and tablets.
- **Performance Advancement**: Offers higher data transfer rates and improved signal integrity compared to DDR3 SO-DIMM.
- **Power Efficiency**: Operates at 1.2V, reducing power consumption by 20% compared to DDR3 modules.
- **Industry Standardization**: Recognized as a technical standard (Wikidata Q...) with cross-platform compatibility across device manufacturers.

## Body
### Overview
DDR4 SO-DIMM is a memory module that integrates the low-profile design of SO-DIMM with the technological advancements of DDR4 SDRAM. It retains the 64-bit data path characteristic of DIMM modules while adopting the smaller physical dimensions of SO-DIMM, typically measuring 67.6mm in length and 30mm in width.

### Technical Specifications
- **Voltage**: Operates at 1.2V, a 20% reduction from DDR3's 1.5V.
- **Data Transfer**: Supports DDR4 speeds, with common modules ranging from 2133 MT/s to 3200 MT/s.
- **Capacity**: Available in densities up to 64GB per module (as per industry adoption, though source data does not specify limits).
- **Compatibility**: Designed for 288-pin SO-DIMM slots, incompatible with full-size DIMM or DDR3 infrastructure.

### Relationship to Other Standards
- **Predecessor**: DDR3 SO-DIMM, which it surpasses in bandwidth and power efficiency.
- **Successor**: DDR5 SO-DIMM, though the source material does not explicitly state this relationship.
- **Parallel Standards**: Coexists with full-size DDR4 DIMM, differing only in form factor.

### Applications
- **Primary Use**: Laptops, ultrabooks, and small form factor desktops.
- **Specialized Roles**: Embedded systems, networking hardware, and industrial control devices requiring compact memory solutions.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "DDR4 SO-DIMM",
  "description": "Smaller form factor of DDR4 DIMM",
  "sameAs": ["https://www.wikidata.org/wiki/Q..."],
  "additionalType": "Technical standard"
}