| Type of RAM | |
 | |
| Developer | JEDEC |
|---|---|
| Type | Synchronous dynamic random-access memory |
| Generation | 5th generation |
| Release date | July 14, 2020[2] |
| Standards |
|
| Clock rate | 2,000–4,400 MHz |
| Cycle time | 16n bank structure |
| Prefetch buffer | 4n |
| Transfer rate | 4–8.8GT/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 a 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 (8 gigatransfers/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]
- ^ Here, K, M, G, or T refer to the binary prefixes based on powers of 1024.
- ^ a b Smith, Ryan (July 14, 2020). "DDR5 Memory Specification Released: Setting the Stage for DDR5-6400 And Beyond". AnandTech. Retrieved July 15, 2020.
- ^ a b "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.
- ^ a b Tyson, 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.
- ^ Shilov, Anton. "SK Hynix Details DDR5-6400". anandtech.com.
- ^ "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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