# DDR4 SDRAM

> fourth generation of double-data-rate synchronous dynamic random-access memory

**Wikidata**: [Q1189682](https://www.wikidata.org/wiki/Q1189682)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DDR4_SDRAM)  
**Source**: https://4ort.xyz/entity/ddr4-sdram

## Summary
DDR4 SDRAM is the fourth generation of double-data-rate synchronous dynamic random-access memory, released in September 2012. It operates at 1.2 volts and offers data transfer speeds up to 170.65 gigabits per second. DDR4 succeeded DDR3 SDRAM and was later followed by DDR5 SDRAM.

## Key Facts
- DDR4 SDRAM was published on September 25, 2012 by JEDEC
- It operates at a voltage of 1.2 volts, lower than DDR3's 1.5 volts
- Data transfer speeds reach up to 170.65 gigabits per second
- DDR4 is a subclass of synchronous dynamic random-access memory
- It is followed by DDR5 SDRAM as the next generation
- DDR4 SO-DIMM is a smaller form factor variant of DDR4 DIMM
- The standard is maintained by JEDEC, the industry standards body

## FAQs
### Q: What is the main advantage of DDR4 SDRAM over DDR3?
A: DDR4 SDRAM operates at a lower voltage (1.2V vs 1.5V) and offers higher data transfer speeds up to 170.65 Gbps compared to DDR3, making it more energy-efficient and faster.

### Q: When was DDR4 SDRAM released?
A: DDR4 SDRAM was published on September 25, 2012 by JEDEC.

### Q: What is the voltage requirement for DDR4 SDRAM?
A: DDR4 SDRAM operates at 1.2 volts, which is lower than the 1.5 volts required by DDR3 SDRAM.

### Q: What comes after DDR4 SDRAM?
A: DDR5 SDRAM is the fifth generation that succeeds DDR4 SDRAM.

### Q: What is DDR4 SO-DIMM?
A: DDR4 SO-DIMM is a smaller form factor variant of DDR4 DIMM designed for compact devices like laptops.

## Why It Matters
DDR4 SDRAM represents a significant advancement in computer memory technology, addressing the growing demands for higher performance and energy efficiency in modern computing systems. By operating at a lower voltage of 1.2V compared to DDR3's 1.5V, DDR4 reduces power consumption while simultaneously increasing data transfer speeds to 170.65 Gbps. This combination of improved performance and efficiency makes DDR4 essential for everything from personal computers to enterprise servers and data centers. The technology enables faster application loading, smoother multitasking, and better overall system responsiveness. As the industry standard for over a decade, DDR4 has powered countless devices and applications, from gaming rigs to cloud computing infrastructure, making it a foundational technology in the digital age.

## Notable For
- Fourth generation of DDR SDRAM technology with significant performance improvements
- Lower operating voltage (1.2V) compared to DDR3, reducing power consumption
- Higher data transfer speeds up to 170.65 Gbps
- Published by JEDEC as an official industry standard
- Successor to DDR3 SDRAM and predecessor to DDR5 SDRAM

## Body
### Technical Specifications
DDR4 SDRAM operates at a base frequency of 333.5 MHz for memory cells and 1333.5 MHz for the bus. The standard supports various data rates and is available in multiple configurations to suit different computing needs. The technology uses a 288-pin DIMM form factor for desktop systems and a 260-pin SO-DIMM for laptops and compact devices.

### Industry Standards and Compliance
The DDR4 SDRAM standard is maintained by JEDEC (Joint Electron Device Engineering Council), the semiconductor engineering standardization body. The specification JESD79-4 defines the DDR4 standard, which is available through JEDEC's document search system. The technology has been widely adopted across the industry and is supported by major processor manufacturers.

### Performance Characteristics
DDR4 SDRAM offers several performance improvements over its predecessor, including higher module densities, improved reliability, and better signal integrity. The technology supports burst lengths of 8 and 16, and introduces new power-saving features such as power-down modes. These enhancements make DDR4 suitable for high-performance computing applications and energy-conscious designs.

### Market Impact
Since its introduction in 2012, DDR4 SDRAM has become the dominant memory technology in new computing devices. The standard has enabled the development of more powerful and efficient systems, supporting applications ranging from consumer electronics to enterprise data centers. Its widespread adoption has driven down costs and improved availability of high-capacity memory modules.

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## References

1. [Source](http://www.jedec.org/news/pressreleases/jedec-announces-publication-ddr4-standard)
2. Freebase Data Dumps. 2013
3. Quora