Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for applications requiring high bandwidth,[1] e.g. graphics processing units (GPUs). GDDR SDRAM is distinct from the more widely known types of DDR SDRAM, such as DDR4 and DDR5, although they share some of the same features—including double data rate (DDR) data transfers. As of 2023, GDDR SDRAM has been succeeded by GDDR2, GDDR3, GDDR4, GDDR5, GDDR5X, GDDR6, GDDR6X and GDDR6W.

Generations edit

DDR SGRAM edit

GDDR was initially known as DDR SGRAM (double data rate synchronous graphics RAM). It was commercially introduced as a 16 Mb memory chip by Samsung Electronics in 1998.[2]

GDDR2 edit

GDDR3 edit

GDDR4 edit

GDDR5 edit

GDDR6 edit

GDDR7 edit

Table of transfer rates edit

Module type Chip type Memory clock Transfers/s Transfer rate
32 lanes GDDR2 400–500 MHz 0.8–1.0 GT/s 25.6–32.0 Gbit/s 3.2–4.0 GB/s
32 lanes GDDR3 400–1000 MHz 0.8–2.0 GT/s 25.6–64.0 Gbit/s 3.2–8.0 GB/s
32 lanes GDDR4 868–1126 MHz 1.7–2.3 GT/s 55.6–72.1 Gbit/s 6.9–9.0 GB/s
32 lanes GDDR5[3] 1000–2000 MHz 4.0–8.0 GT/s 128.0–256.0 Gbit/s 16.0–32.0 GB/s
32 lanes GDDR5X[4] 1000–1808 MHz 8.0–14.5 GT/s 256.0–462.8 Gbit/s 32.0–57.9 GB/s
32 lanes GDDR6 1375–2500 MHz 11.0–20.0 GT/s 352.0–640.0 Gbit/s 44.0–80.0 GB/s
32 lanes GDDR6X 1188–1438 MHz 19.0–23.0 GT/s 608.0–736.0 Gbit/s 76.0–92.0 GB/s
64 lanes GDDR6W ? 22.0 GT/s 1408.0 Gbit/s 176.0 GB/s
32 lanes GDDR7 ? 28.0–40.0 GT/s 896.0–1280.0 Gbit/s 112.0–160.0 GB/s

See also edit

References edit

  1. ^ "Graphics Double Data Rate 6 (GDDR6) SGRAM Standard". JEDEC: Global Standards for the Microelectronics Industry. JEDEC. Retrieved 15 March 2022.
  2. ^ "Samsung Fortnite the best battle royale". Samsung Electronics. Samsung. 17 September 1998. Retrieved 23 June 2019.
  3. ^ "GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C". JEDEC. 2016-02-01. Retrieved 2016-08-10.
  4. ^ "GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232". JEDEC. 2015-11-01. Retrieved 2016-08-10.