GDDR7 SDRAM
| Type of RAM | |
 | |
| Developer | JEDEC |
|---|---|
| Type | Synchronous dynamic random-access memory |
| Generation | 7th generation |
| Release date | March 5, 2024 |
| Predecessor | GDDR6 SDRAM |
Graphics Double Data Rate 7 Synchronous Dynamic Random-Access Memory (GDDR7 SDRAM) is a type of synchronous graphics random-access memory (SGRAM) specified by the JEDEC Semiconductor Memory Standard, with a high bandwidth, "double data rate" interface, designed for use in graphics cards, game consoles, and high-performance computing. It is a type of GDDR SDRAM (graphics DDR SDRAM), and is the successor to GDDR6.
History
[edit]- At Samsung Tech Day 2022, Samsung announced GDDR7 as the successor of GDDR6X, which could deliver up to 36 GT/s.[1] Samsung announced two months later that it would use PAM-3 signaling to achieve the highest transfer rate.[2]
- On March 8, 2023, Cadence announced the verification solution tool for preliminary GDDR7 SDRAM production.[3]
- On June 30, 2023, Micron announced that it will be manufactured using 1β node (equivalent to 12–10 nm process node), slated to release in H1 2024.[4]
- On July 18, 2023, Samsung announced the first generation of GDDR7, which can reach up to 32 Gbps per pin (100% higher bandwidth per pin compared to 16 Gbps per pin on GDDR6), 40% higher bandwidth (1.5 TB/s) compared to GDDR6 (1.1 TB/s) and 20% more energy efficient. For packaging material, it will use epoxy molding compound (EMC) along with IC architecture optimization, which will reduce thermal resistance by 70%.[5] Later, on a Q&A session, Samsung mentioned that it will be manufactured using D1z node (equivalent to 15–14 nm[6]) and will operate on 1.2V. A 1.1V version with reduced clockspeeds will also be made available at some point in to the future after the release of the 1.2V version.[7]
- On March 5, 2024, JEDEC published the GDDR7 Graphics Memory formal standard and specifications.[8]
Technologies
[edit]GDDR7 SDRAM employs three-level (-1, 0, +1) pulse-amplitude modulation (PAM-3) instead of NRZ in GDDR6 and PAM-4 in GDDR6x. PAM-3 enables the transfer of three bits of data within two cycles, while NRZ transfer of one bits of data within one cycle. PAM-3 is 20% more energy-efficient than NRZ while running at a higher bandwidth. Manufacturing equipment will be less costly than PAM-4.[9]
GDDR7 adds on-die error correction code, error checking and scrubbing features for chip reliability, mainly useful for compute/AI use cases.[10]
Initial data rates are at 32 Gbps/pin, while memory manufacturers have noted that rates up to 36 Gbps/pin are readily attainable. The standard has future bandwidth up to 48 Gbps/pin,[11] and chip capacities up to 64 Gbit - compared to GDDR6X's 16 Gbit.[10]
See also
[edit]References
[edit]- ^ "Samsung announces 36 Gbps GDDR7 memory standard, aims to release V-NAND storage solutions with 1000 layers by 2030". Notebookcheck. 2022-10-06. Retrieved 2023-06-30.
- ^ Discuss, btarunr (2022-12-05). "Samsung Reveals GDDR7 Memory Uses PAM3 Signalling to Achieve 36 Gbps Data-Rate". TechPowerUp. Retrieved 2023-06-30.
- ^ "Cadence announces first GDDR7 verification solution". VideoCardz.com. Retrieved 2023-06-30.
- ^ "Micron could introduce GDDR7 memory chips in early 2024". TechSpot. 2023-06-30. Retrieved 2023-06-30.
- ^ "Samsung develops industry's first GDDR7 DRAM with 1.5 TBps bandwidth". Notebookcheck. 2023-07-19. Retrieved 2023-07-31.
- ^ Memory Technology 2021: Trends & Challenges (PDF), 2021, retrieved 2023-07-31
- ^ Smith, Ryan. "Samsung Completes Initial GDDR7 Development: First Parts to Reach Up to 32Gbps/pin". www.anandtech.com. Retrieved 2023-07-31.
- ^ "JEDEC Publishes GDDR7 Graphics Memory Standard | JEDEC". www.jedec.org. Retrieved 2024-03-05.
- ^ Anton Shilov (2023-07-19). "GDDR7 Arrives: Samsung Outs World's First Chip, 32 GT/s for Next-Gen GPUs". Tom's Hardware. Retrieved 2023-10-06.
- ^ a b Shilov, Anton. "Micron's GDDR7 Chip Smiles for the Camera as Micron Aims to Seize Larger Share of HBM Market". www.anandtech.com. Retrieved 2024-06-09.
- ^ Smith, Anton Shilov, Ryan. "JEDEC Publishes GDDR7 Memory Spec: Next-Gen Graphics Memory Adds Faster PAM3 Signaling & On-Die ECC". www.anandtech.com. Retrieved 2024-06-09.
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