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A normally clocked PCI bus (33MHz) can achieve a maximum of 132MB/s.

AGP stands for Accelerated Graphics Port. Normal AGP is 4 times the PCI bus speed, thus 4 x 33 = 133MHz. AGP running in 4x mode has a transfer rate in excess of 1000 MB/s. AGP 8x allows for 8 transfer per clock cycle in 4 bytes bandwith at bus frequency of 66 MHz, thus allowing a data transfer rate up to 2112 MB/sec.

PCI Express for graphics is abbreviated as "PCIe" or "PCI-E" and should not be confused with the PCI-X slot.

While a motherboard can only have one AGP slot, PCIe allows the ability to put more than one graphics card in the PC allowing a load split and better rendering of graphics. The two cards do not have to be identical.

SLI is the acronym for Scalable Link Interface.SLI allows you to connect two video cards to theoretically double your gaming performance. However, driver issues and certain software engines might prevent this from happening, which means you can expect a performance increase of about 40% compared to running a single video card. You must have identical video cards to run SLI and your motherboard must support the mode.