Direct AGP is the method these products use to integrate the graphics controller with the Memory Controller Hub (MCH), which together are called the Graphics and Memory Controller Hub (GMCH). Unlike AGP, which has to go through the AGP bus to get to the MCH and system memory, with Direct AGP the graphic controller communicates directly with system memory. The Direct AGP video memory transfer speed is the same as the memory transfer speed of the chipset and system memory.
For example: With dual channel DDR400 system memory and an Intel(R) 865G chipset, this results in a Direct AGP speed of 6.4 gigabytes per second (GBps). For comparison, an AGP 8x graphics card transfers data from system memory at a maximum of 2.1 GBps.
This applies to: