GDDR5
Graphics Double Data Rate version 5 (GDDR5) is a type of VRAM (video RAM), is the successor of GDDR4, but not yet used in the final product of a VGA card. With a bandwidth of 20GB / s with 32-per-IC bus. means for configuration * 1GB VRAM ICs for bandwidth will result in 160 GB / s with 256-bit bus.