Type of memory used on graphics cards
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[update] , GDDR SDRAM has been succeeded by GDDR2 , GDDR3 , GDDR4 , GDDR5 , GDDR5X , GDDR6 , GDDR6X and GDDR6W .
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]
Table of transfer rates [ edit ] Module type Chip type Memory clock Transfers/s Transfer rate 32 lanes GDDR2 400–500 MHz 0.8–1.0 GT/s 25.6–32.0 Gbit/s 3.2–4.0 GB/s 32 lanes GDDR3 400–1000 MHz 0.8–2.0 GT/s 25.6–64.0 Gbit/s 3.2–8.0 GB/s 32 lanes GDDR4 868–1126 MHz 1.7–2.3 GT/s 55.6–72.1 Gbit/s 6.9–9.0 GB/s 32 lanes GDDR5 [ 3] 1000–2000 MHz 4.0–8.0 GT/s 128.0–256.0 Gbit/s 16.0–32.0 GB/s 32 lanes GDDR5X [ 4] 1000–1808 MHz 8.0–14.5 GT/s 256.0–462.8 Gbit/s 32.0–57.9 GB/s 32 lanes GDDR6 1375–2500 MHz 11.0–20.0 GT/s 352.0–640.0 Gbit/s 44.0–80.0 GB/s 32 lanes GDDR6X 1188–1438 MHz 19.0–23.0 GT/s 608.0–736.0 Gbit/s 76.0–92.0 GB/s 64 lanes GDDR6W ? 22.0 GT/s 1408 .0 Gbit/s 176.0 GB/s 32 lanes GDDR7 ? 28.0–40.0 GT/s 896.0–1280 .0 Gbit/s 112.0–160.0 GB/s
GPU
Architecture Components Memory Form factor Performance Misc