DDR4 SDRAM
| Type of RAM | |
| Developer | JEDEC |
|---|---|
| Type | Synchronous dynamic random-access memory (SDRAM) |
| Generation | 4th generation |
| Release date | 2014 |
| Standards |
|
| Clock rate | 800–1600 MHz |
| Cycle time | 0.625 ns to 1.25 ns |
| Prefetch buffer | 8n-prefetch architecture |
| Bus clock rate | 1600 MT/s to 3200 MT/s. |
| Transfer rate | 12.8 GB/s to 25.6 GB/s |
| Voltage | Reference 1.2 V |
| Predecessor | DDR3 SDRAM (2007) |
| Successor | DDR5 SDRAM (2020) |
Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high bandwidth ("double data rate") interface.
Released to the market in 2014,[2][3][4] it is a variant of dynamic random-access memory (DRAM), some of which have been in use since the early 1970s,[5] and a higher-speed successor to the DDR2 and DDR3 technologies.
DDR4 is not compatible with any earlier type of random-access memory (RAM) due to different signaling voltage and physical interface, besides other factors.
DDR4 SDRAM was released to the public market in Q2 2014, focusing on ECC memory,[6] while the non-ECC DDR4 modules became available in Q3 2014, accompanying the launch of Haswell-E processors that require DDR4 memory.[7]
- ^ Here, K, M, G, or T refer to the binary prefixes based on powers of 1024.
- ^ Marc (2011-04-05). "Hynix produces its first DDR4 modules". Be hardware. Archived from the original on 2012-04-15. Retrieved 2012-04-14.
- ^ Micron teases working DDR4 RAM, Engadget, 2012-05-08, retrieved 2012-05-08
- ^ "Samsung mass-produces DDR4". Retrieved 2013-08-31.
- ^ The DRAM Story (PDF), IEEE, 2008, p. 10, archived from the original (PDF) on June 4, 2011, retrieved 2012-01-23
- ^ "Crucial DDR4 Server Memory Now Available". Globe newswire. 2 June 2014. Retrieved 12 December 2014.
- ^ btarunr (14 September 2014). "How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream". TechPowerUp. Retrieved 28 April 2015.