GDDR SDRAM

Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for graphics processing units (GPUs). GDDR SDRAM is distinct from the more widely known types of DDR SDRAM, such as DDR3, although they share some of the same features—including double data rate data transfers. As of 2018, GDDR SDRAM has been succeeded by GDDR2, GDDR3, GDDR4, GDDR5, GDDR5X, and GDDR6.

Computer memory types
Volatile
RAM
Historical
Non-volatile
ROM
NVRAM
Early stage NVRAM
Magnetic
Optical
In development
Historical
Hynix GDDR SDRAM

Generations
See also: Synchronous dynamic random-access memory § Timeline

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.[1]

GDDR2
Main article: GDDR2

GDDR3
Main article: GDDR3 SDRAM

GDDR4
Main article: GDDR4 SDRAM

GDDR5
Main article: GDDR5 SDRAM
See also: GDDR5X

GDDR6
Main article: GDDR6 SDRAM


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[2]625–1000 MHz5–8 GT/s320–512 Gbit/s40–64 GB/s
64 lanesGDDR5X[3]625–875 MHz10–12 GT/s640–896 Gbit/s80–112 GB/s
64 lanes GDDR6 875–1000 MHz 14–16 GT/s 896–1024 Gbit/s 112–128 GB/s

See also


References
  1. "Samsung Electronics Comes Out with Super-Fast 16M DDR SGRAMs". Samsung Electronics. Samsung. 17 September 1998. Retrieved 23 June 2019.
  2. "GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C". JEDEC. 2016-02-01. Retrieved 2016-08-10.
  3. "GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232". JEDEC. 2015-11-01. Retrieved 2016-08-10.
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