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

DDR SGRAM

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

GDDR3

GDDR4

GDDR5

GDDR6

GDDR7

Table of transfer rates

Module typeChip typeMemory clockTransfers/sTransfer rate
 ?GDDR2500 MHz ?128 Gbit/s16.0 GB/s
64 lanesGDDR3625 MHz2.5 GT/s159 Gbit/s19.9 GB/s
64 lanesGDDR4275 MHz2.2 GT/s140.8 Gbit/s17.6 GB/s
64 lanesGDDR5[3]625–1125 MHz5–9 GT/s320–576 Gbit/s40–72 GB/s
64 lanesGDDR5X[4]625–875 MHz10–12 GT/s640–896 Gbit/s80–112 GB/s
64 lanes GDDR6 875–1125 MHz 14–18 GT/s 896–1152 Gbit/s 112–144 GB/s
64 lanes GDDR6X 594–656 MHz 19–21 GT/s 1216–1344 Gbit/s 152–168 GB/s
 ? GDDR6W  ?  ?―22 GT/s  ?  ?
 ? GDDR7  ?  ?―36 GT/s  ?  ?

See also

References

  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.
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