Accelerated Graphics Port definition hardware, graphics
(AGP) A bus
specification by Intel
which gives low-cost 3D graphics cards faster access to main memory
on personal computers
than the usual PCI
AGP dynamically allocates the PC's normal RAM
to store the screen image and to support texture mapping, z-buffering and alpha blending.
Intel has built AGP into a chipset
for its Pentium II
microprocessor. AGP cards are slightly longer than a PCI card.
AGP operates at 66 MHz
, doubled to 133 MHz, compared with PCI's 33 Mhz. AGP allows for efficient use of frame buffer
memory, thereby helping 2D graphics performance as well.
AGP provides a coherent memory management design which allows scattered data in system memory to be read in rapid bursts. AGP reduces the overall cost of creating high-end graphics subsystems by using existing system memory.