Fifth generation of double-data-rate synchronous dynamic random-access memory
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
16 GB[1] DDR5-4800 1.1 V UDIMM
Developer
JEDEC
Type
Synchronous dynamic random-access memory
Generation
5th generation
Release date
July 14, 2020; 3 years ago (2020-07-14)[2]
Standards
DDR5-4000 (PC5-32000)
DDR5-4400 (PC5-35200)
DDR5-4800 (PC5-38400)
DDR5-5200 (PC5-41600)
DDR5-5600 (PC5-44800)
DDR5-6000 (PC5-48000)
DDR5-6200 (PC5-49600)
DDR5-6400 (PC5-51200)
DDR5-6800 (PC5-54400)
DDR5-7200 (PC5-57600)
DDR5-7600 (PC5-60800)
DDR5-8000 (PC5-64000)
[3][4]
Clock rate
2,000–4,000 MHz
Cycle time
16n bank structure
Prefetch buffer
4n
Transfer rate
4–8GT/s
Bandwidth
32–64 GB/s[a]
Voltage
1.1 V nominal (actual levels are regulated by on-the-module regulators)
Predecessor
DDR4 SDRAM (2014)
Successor
DDR6 SDRAM
Double Data Rate 5 Synchronous Dynamic Random-Access Memory (DDR5 SDRAM) is the latest type of synchronous dynamic random-access memory. Compared to its predecessor DDR4 SDRAM, DDR5 was planned to reduce power consumption, while doubling bandwidth.[5] The standard, originally targeted for 2018,[6] was released on July 14, 2020.[2]
A new feature called Decision Feedback Equalization (DFE) enables input/output (I/O) speed scalability for higher bandwidth and performance improvement. DDR5 has about the same latency (around 14 ns) as DDR4 and DDR3.[7] DDR5 octuples the maximum DIMM capacity from 64 GB to 512 GB.[8][3] DDR5 also has higher frequencies than DDR4, up to 8GT/s which translates into 64 GB/s (8000 megatransfers/second * 64-bit width / 8 bits/byte = 64 GB/s) of bandwidth per DIMM.
Rambus announced a working DDR5 dual in-line memory module (DIMM) in September 2017.[9][10] On November 15, 2018, SK Hynix announced completion of its first DDR5 RAM chip; running at 5.2 GT/s at 1.1 V.[11] In February 2019, SK Hynix announced a 6.4 GT/s chip, the highest speed specified by the preliminary DDR5 standard.[12] The first production DDR5 DRAM chip was officially launched by SK Hynix on October 6, 2020.[13][14]
The separate JEDEC standard Low Power Double Data Rate 5 (LPDDR5), intended for laptops and smartphones, was released in February 2019.[15]
Compared to DDR4, DDR5 further reduces memory voltage to 1.1 V, thus reducing power consumption. DDR5 modules incorporate on-board voltage regulators in order to reach higher speeds.[10]
There is a general expectation that most use-cases that currently used DDR4 will eventually migrate to DDR5.
^Here, K, M, G, or T refer to the binary prefixes based on powers of 1024.
^ abSmith, Ryan (July 14, 2020). "DDR5 Memory Specification Released: Setting the Stage for DDR5-6400 And Beyond". AnandTech. Retrieved July 15, 2020.
^ ab"DDR5 Memory Standard: An introduction to the next generation of DRAM module technology - Kingston Technology". Kingston Technology. Retrieved February 19, 2023.
^"DDR5 SDRAM Product Core Data Sheet" (PDF). Micron. Retrieved April 4, 2023.
^Manion, Wayne (March 31, 2017). "DDR5 will boost bandwidth and lower power consumption". Tech Report. Retrieved April 1, 2017.
^Cunningham, Andrew (March 31, 2017). "Next-generation DDR5 RAM will double the speed of DDR4 in 2018". Ars Technica. Retrieved January 15, 2018.
^Dr. Ian Cutress. "Insights into DDR5 Sub-timings and Latencies". AnandTech.
^"DDR5 vs DDR4 – All the Design Challenges & Advantages".
^Lilly, Paul (September 22, 2017). "DDR5 memory is twice as fast as DDR4 and slated for 2019". PC Gamer. Retrieved January 15, 2018.
^ abTyson, Mark (September 22, 2017). "Rambus announces industry's first fully functional DDR5 DIMM - RAM - News". hexus.net.
^Malakar, Abhishek (November 18, 2018). "SK Hynix Develops First 16 Gb DDR5-5200 Memory Chip". Archived from the original on March 31, 2019. Retrieved November 18, 2018.
^"SK hynix Launches World's First DDR5 DRAM". hpcwire.com.
^"SK hynix: DDR5 DRAM Launches". businesskorea.co.kr. October 7, 2020.
^"JEDEC Updates Standard for Low Power Memory Devices: LPDDR5" (Press release). JEDEC. February 19, 2019.
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