DDR5 SDRAM

DDR5 SDRAM is the official abbreviation for Double Data Rate 5 Synchronous Dynamic Random-Access Memory. Compared to its predecessor DDR4 SDRAM, DDR5 is planned to reduce power consumption, while doubling bandwidth.[2] As of June 2020, the standard is still being finalized by JEDEC, and is expected to be published in 2020[1] (2018 had previously been the release target).[3] Some companies were planning to bring the first products to market by the end of 2019.[4] The independent JEDEC standard LP-DDR5 (Low Power Double Data Rate 5), intended for laptops and smartphones, was released in February 2019.[5]

This article is about DDR5 SDRAM. For graphics DDR5, based on DDR3, see GDDR5 SDRAM.

DDR5 SDRAM
Double Data Rate 5 Synchronous Dynamic Random-Access Memory
Type of RAM
DeveloperJEDEC
TypeSynchronous dynamic random-access memory
Generation5th generation
Release date2020 (2020) (estimated)[1]
Voltage1.1 V
PredecessorDDR4 SDRAM

Rambus announced a working DDR5 DIMM in September 2017.[6] On November 15, 2018, SK Hynix announced completion of its first DDR5 RAM chip; it runs at 5200 MT/s at 1.1 volts.[7] In February 2019, SK Hynix announced a 6400 MT/s chip, the highest speed officially allowed by the preliminary DDR5 standard.[8]

Compared to DDR4, DDR5 further reduces memory module voltage to 1.1 V, thus reducing power consumption. DDR5 modules can incorporate on-board voltage regulators in order to reach higher speeds; as this will increase cost it is expected to be implemented only on server-grade and possibly high-end consumer modules.[9] DDR5 supports a speed of 51.2 GB/s per module[10] and 2 memory channels per module.[11][12]

There is a general expectation that most use-cases which currently use DDR4 will eventually migrate to DDR5. To be usable in desktops and servers (laptops will presumably use LPDDR5 instead), the integrated memory controllers of e.g. Intel's and AMD's CPUs will have to support it; as of June 2020, there has not been any official announcements of support from either, but a leaked slide shows planned DDR5 support on Intel's 2021 Sapphire Rapids microarchitecture.[13] According to AMD's Forrest Norrod, AMD's mid-2020 Zen 3 based third generation Epyc CPUs will still use DDR4.[14] A leaked internal AMD roadmap is reported to show DDR5 support for 2022 Zen 4 CPUs and Zen 3+ APUs.[15]

References
  1. https://www.jedec.org/ddr5details
  2. Manion, Wayne (March 31, 2017). "DDR5 will boost bandwidth and lower power consumption". Tech Report. Retrieved April 1, 2017.
  3. Cunningham, Andrew (March 31, 2017). "Next-generation DDR5 RAM will double the speed of DDR4 in 2018". Ars Technica. Retrieved January 15, 2018.
  4. "SK Hynix, Samsung Detail the DDR5 Products Arriving This Year". Tom's Hardware. February 23, 2019.
  5. "JEDEC Updates Standard for Low Power Memory Devices: LPDDR5". jedec.org. Retrieved February 19, 2019.
  6. Lilly, Paul (September 22, 2017). "DDR5 memory is twice as fast as DDR4 and slated for 2019". PC Gamer. Retrieved January 15, 2018.
  7. Malakar, Abhishek (November 18, 2018). "SK Hynix Develops First 16 Gb DDR5-5200 Memory Chip".
  8. Shilov, Anton. "SK Hynix Details DDR5-6400". www.anandtech.com.
  9. "Rambus announces industry's first fully functional DDR5 DIMM - RAM - News - HEXUS.net". m.hexus.net.
  10. Lilly, Paul (September 22, 2017). "DDR5 memory is twice as fast as DDR4 and slated for 2019".
  11. "What We Know About DDR5 So Far". Tom's Hardware. June 7, 2019.
  12. "DDR5 - The Definitive Guide!". April 27, 2019.
  13. Verheyde 2019-05-22T16:50:03Z, Arne. "Leaked Intel Server Roadmap Shows DDR5, PCIe 5.0 in 2021, Granite Rapids in 2022". Tom's Hardware.
  14. Cutress, Dr Ian. "An Interview with AMD's Forrest Norrod: Naples, Rome, Milan, & Genoa". www.anandtech.com.
  15. "HW News - Supercomputer Cryptomining Malware, DDR5 & AMD, Ryzen 3 1200 AF". Gamers Nexus.
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