Nvidia NFORCE 680I - Manual (Page 34)

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Hardware Installation
PCI Express x1 Slots
There are two PCI Express x1 slots that are designed to accommodate less
bandwidth-intensive cards, such as a modem or LAN card. The PCIe x1 slot provides
250 MB/sec bandwidth.
PCI Express x16 Slots
There are two PCI Express x16 slots that are reserved for graphics cards. The
bandwidth of the x16 slot is up to 4GB/sec (8GB/sec concurrent). The design of this
motherboard supports dual PCI-Express graphics cards using NVIDIA’s SLI technology.
When installing a PCI Express x16 card, be sure the retention clip snaps and locks the
card into place. If the card is not seated properly, it could cause a short across the pins.
Secure the card’s metal bracket to the chassis back panel with the screw used to hold
the blank cover.
Clear CMOS Jumper
The motherboard uses the CMOS RAM to store all of the set BIOS parameters. The
CMOS can be cleared by removing the CMOS jumper.
Use the following procedure to clear CMOS:
1. Turn off the AC power supply and connect pins 1 and 2 together using the jumper cap.
2. Return the jumper setting to normal (pins 2 and 3).
3. Turn the AC power supply back on.
CMOS Jumper
location