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The port on a motherboard for expansion cards is called a slot. Accelerated Graphics Port (AGP) is a dedicated point-to-point connection for graphics cards, with faster data rates than PCI. AGP also has pipelined processing and sideband addressing techniques, and can designate RAM for graphics processing.
In the computer world, one of the things the word port can refer to is a physical interface or access point on the motherboard or system board. The door is shaped like a slot into which an expansion card or graphics card opens in a motion often described as pushing toast into a toaster oven. Accelerated Graphics Port (AGP), made by Intel®, is one of the types of slots that can appear on a motherboard, along with Peripheral Component Interconnect (PCI) slots, for example. The accelerated graphics port was developed to allow 3D graphics to be displayed faster and smoother on a basic computer than was previously possible, but most newer motherboards have PCI Express (PCI- E or PCIe).
Back in 1996, when the accelerated graphics port came out, the peak data rate was one of the key differences. In 2003, the data rate for PCI was up to 133 MBps. (megabytes per second). AGP provided data rates up to 533 MBps. With AGP 8x, the speed was increased to 2 GBps (gigabytes per second). AGP also differs from PCI in that it is a dedicated point-to-point connection that connects the graphics card to the CPU, rather than the bus connection used by PCI.
The accelerated graphics port differs from PCI in several other ways, each of which tends to optimize graphics processing. First, it’s a dedicated port, which connects solely to your graphics card. Second, graphics information from PCI is non-pipelined, while that from AGP is: with non-pipelined processing, information is transmitted sequentially, with each detail waiting for the previous one to finish processing; in pipelined processing, a single request can contain multiple packets of data. Third, the sideband addressing technique changed the way address information was transmitted on data packets, speeding up processing and reducing bandwidth requirements. Another advancement of the accelerated graphics port was to allow the operating system (operating system) to designate RAM to set aside for use by the graphics card. This reduces the load on the graphics card memory and results in more RAM in graphics processing.
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