PCI-E (PCI Express) Video Cards
PCI-E is the new I/O bus technology that is well on its way to replacing AGP. PCI-E offers many advantages over AGP including increased bandwidth. Each PCI Express lane is capable of speeds up to 250 MB per second in each direction and increasing. PCI-E cards use a 1, 4, 8 or 16 lane slot (x1, x4, x8 and x16). A 164-pin x16 slot can provide around 4 GB per second, nearly twice the speed of AGP. All new video cards from NVIDIA and ATI will have a PCI Express version.
A major advantage of PCI Express is SLI. With SLI, two high-end PCI Express video cards can be installed in a PC and work together as one for much greater processing power. SLI requires a special motherboard with two PCI Express slots that support SLI and two PCI Express video cards with the same GPU.
SLI supports dual video card setups. Quad SLI takes it a step further with support for 4 GPUs. The first Quad SLI PC was unveiled at the 2006 Consumer Electronics Show by Dell and NVIDIA.
PCI-E Video Card Resources
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