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DDR4 SDRAM information


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; 10 years ago (2014)
Standards
  • DDR4-1600 (PC4-12800)
  • DDR4-1866 (PC4-14900)
  • DDR4-2133 (PC4-17000)
  • DDR4-2400 (PC4-19200)
  • DDR4-2666 (PC4-21333)
  • DDR4-2933 (PC4-23466)
  • DDR4-3200 (PC4-25600)
Clock rate800–1600 MHz
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), of which some 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, 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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Memory module

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UniDIMM

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number of clock ticks instead of absolute time, the actual time for an SDRAM module to respond to a CAS event might vary between uses of the same module...

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