Back دي دي آر 4 إس دي رام Arabic DDR4 SDRAM Catalan DDR4 SDRAM Czech DDR-SDRAM#DDR4-SDRAM German DDR4 SDRAM Spanish DDR4 SDRAM Estonian DDR4 SDRAM French DDR4 Italian DDR4 SDRAM Japanese DDR4 SDRAM Korean

DDR4 SDRAM

This article is about DDR4 SDRAM. For graphics DDR4, see GDDR4 SDRAM. For the video game, see Dance Dance Revolution 4thMix.
DDR4 SDRAM
Double Data Rate 4 Synchronous Dynamic Random-Access Memory
Type of RAM
16 GiB[1] DDR4-2666 1.2 V UDIMM
DeveloperJEDEC
TypeSynchronous dynamic random-access memory (SDRAM)
Generation4th generation
Release date2014 (2014)
Standards
  • DDR4-1600 (PC4-12800)
  • DDR4-1866 (PC4-14900)
  • DDR4-2133 (PC4-17000)
  • DDR4-2400 (PC4-19200)
  • DDR4-2666 (PC4-21300)
  • DDR4-2933 (PC4-23466)
  • DDR4-3200 (PC4-25600)
Clock rate800–1600 MHz
Cycle time0.625 ns to 1.25 ns
Prefetch buffer8n-prefetch architecture
Bus clock rate1600 MT/s to 3200 MT/s.
Transfer rate12.8 GB/s to 25.6 GB/s
Voltage Reference 1.2 V
PredecessorDDR3 SDRAM (2007)
SuccessorDDR5 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]

  1. ^ Here, K, M, G, or T refer to the binary prefixes based on powers of 1024.
  2. ^ Marc (2011-04-05). "Hynix produces its first DDR4 modules". Be hardware. Archived from the original on 2012-04-15. Retrieved 2012-04-14.
  3. ^ Micron teases working DDR4 RAM, Engadget, 2012-05-08, retrieved 2012-05-08
  4. ^ "Samsung mass-produces DDR4". Retrieved 2013-08-31.
  5. ^ The DRAM Story (PDF), IEEE, 2008, p. 10, archived from the original (PDF) on June 4, 2011, retrieved 2012-01-23
  6. ^ "Crucial DDR4 Server Memory Now Available". Globe newswire. 2 June 2014. Retrieved 12 December 2014.
  7. ^ btarunr (14 September 2014). "How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream". TechPowerUp. Retrieved 28 April 2015.

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