GDDR was initially known as DDR SGRAM (double data rate synchronous graphics RAM). It was commercially introduced as a 16Mb memory chip by Samsung Electronics in 1998. Compared to DDR SDRAM which is byte-accessible, GDDR SDRAM is block-accessible.

GDDR2

GDDR3

GDDR4

GDDR5

GDDR6

GDDR7

Table of transfer rates

(1 lane is equivalent to

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