Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for applications requiring high bandwidth, 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. , GDDR SDRAM has been succeeded by GDDR2, GDDR3, GDDR4, GDDR5, GDDR5X, GDDR6, GDDR6X, GDDR6W and GDDR7.
Generations
DDR SGRAM 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 Module type Chip type Memory clock Transfers/s Transfers/clock Transfer rate 32 lanesGDDR2232 lanesGDDR3232 lanesGDDR4232 lanesGDDR5432 lanesGDDR5X832 lanesGDDR6832 lanesGDDR6X1664 lanesGDDR6W1632 lanesGDDR716 (1 lane is equivalent to 1 bit/transfer.)
See also Video random-access memory High Bandwidth Memory
References