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Recommended Book
PCI Express System Architecture (PC System Architecture Series)
By Tom Shanley
Addison-Wesley Professional
Price: $43.49

Home » Motherboard » Bus
PCI Express Bus Tutorial
Author: Cássio Lima
Type: Tutorials Last Updated: September 6, 2005
Page: 4 of 4
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Slot Types

The PCI Express bus defines a different type of slot based on the number of lanes in the system. For example, the physical size of the PCI Express bus x1 slot is different from that of the PCI Express bus x4. In Figure 4 you can see the difference between the PCI Express bus slots.

PCI Express Tutorial
click to enlarge
Figure 4: Types of PCI Express slots.

PCI Express Tutorial
click to enlarge
Figure 5: Detail of the PCI and PCI Express slots in the motherboard.

The PCI Express x16 slot was developed to be used by video cards.

PCI Express Tutorial
click to enlarge
Figure 6: Difference in the edge contacts of PCI Express, AGP and PCI video cards.

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