GDDR7 SDRAM

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GDDR7 SDRAM
Graphics Double Data Rate 7 Synchronous Dynamic Random-Access Memory
Type of RAM
Developer JEDEC
Type Synchronous dynamic random-access memory
Generation7th generation
Release date5 March 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.

Contents

History

Technologies

GDDR7 SDRAM employs PAM-3 signaling (three-level pulse-amplitude modulation) rather than NRZ. PAM-3 is 20% more energy-efficient than NRZ while running at a higher bandwidth. Manufacturing equipment will be less costly than PAM-4. PAM-3 processes 1.58 bits per cycle, while NRZ processes only 1 bit per cycle. [9] GDDR7 SDRAM also will be manufactured using 1ß node (equivalent to 12–10 nm process node), which will be the last DRAM production process that will rely on deep ultraviolet (DUV) lithography tools; future devices will be produced using extreme ultraviolet lithography (EUV).

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

Related Research Articles

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References

  1. ↑ "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.
  2. ↑ Discuss, btarunr (2022-12-05). "Samsung Reveals GDDR7 Memory Uses PAM3 Signalling to Achieve 36 Gbps Data-Rate". TechPowerUp. Retrieved 2023-06-30.
  3. ↑ "Cadence announces first GDDR7 verification solution". VideoCardz.com. Retrieved 2023-06-30.
  4. ↑ "Micron could introduce GDDR7 memory chips in early 2024". TechSpot. 2023-06-30. Retrieved 2023-06-30.
  5. ↑ "Samsung develops industry's first GDDR7 DRAM with 1.5 TBps bandwidth". Notebookcheck. 2023-07-19. Retrieved 2023-07-31.
  6. ↑ Memory Technology 2021: Trends & Challenges (PDF), 2021, retrieved 2023-07-31
  7. ↑ Smith, Ryan. "Samsung Completes Initial GDDR7 Development: First Parts to Reach Up to 32Gbps/pin". www.anandtech.com. Retrieved 2023-07-31.
  8. ↑ "JEDEC Publishes GDDR7 Graphics Memory Standard | JEDEC". www.jedec.org. Retrieved 2024-03-05.
  9. ↑ 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.
  10. 1 2 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.
  11. ↑ 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.{{cite web}}: CS1 maint: multiple names: authors list (link)
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