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Related to GDDR: GDFR
GDDR(Graphics Double Data Rate) GDDR is double data rate (DDR) memory specialized for fast rendering on graphics cards (GPUs). Introduced in 2000, GDDR is the primary graphics RAM in use today. GDDR is technically "GDDR SGRAM," superseding VRAM and WRAM. Although based on DDR memory, the versions do not correspond numerically. For example, GDDR3 was based on DDR2 chips; GDDR5 on DDR3 and so on. Each GDDR generation is faster and includes enhancements.
As of 2019, GDDR6 is the current version providing a 16 Gbps data rate instead of 13 Gbps for GDDR5X and twice that of GDDR5. GDDR6 also supports the same 32-byte read/write access as GDDR5. See DDR and GPU.