Viglen Vig644M Manual page 25

 PCI Express Slot
The PCI Express slot supports the PCI Express interface expansion card. The PCI
Express x16 slot supports up 4.0 GB/s transfer rate and the PCI Express x1 slot supports
up to 250 MB/s
Figure 15: PCI Express Slots
Note: When adding or removing expansion cards, make sure that you unplug the power
supply first.
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V1.0 Vig644M Motherboard Manual