GDDR SDRAM

Hynix 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.

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.

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 type	Chip type	Memory clock	Transfers/s	Transfer rate
?	GDDR2	500 MHz	?	128 Gbit/s	16.0 GB/s
64 lanes	GDDR3	625 MHz	2.5 GT/s	159 Gbit/s	19.9 GB/s
64 lanes	GDDR4	275 MHz	2.2 GT/s	140.8 Gbit/s	17.6 GB/s
64 lanes	GDDR5	625–1000 MHz	5–8 GT/s	320–512 Gbit/s	40–64 GB/s
64 lanes	GDDR5X	625–875 MHz	10–12 GT/s	640–896 Gbit/s	80–112 GB/s
64 lanes	GDDR6	875–1000 MHz	14–16 GT/s	896–1024 Gbit/s	112–128 GB/s

See also

• Double data rate