Nvidia NFORCE 680I - Manual (Page 25)

Power Connections
This motherboard requires an ATX power supply. To support a PCI Express motherboard
with the addition of dual graphics cards using NVIDIA SLI technology, you are going to
need a minimum of a 500W power supply. Make sure you have enough power to cover
all the expansion cards you will be installing. To determine what you power requirements
are for your specific configuration, refer to www.slizone.com.
24-pin ATX Power (PWR1)
PWR1 is the main power supply connector located along the edge of the board next to
the DIMM slots. Make sure that the power supply cable and pins are properly aligned
with the connector on the motherboard. Firmly plug the power supply cable into the
connector and make sure it is secure.
Figure 3. PWR1 Motherboard Connector
Table 1. PWR1 Pin Assignments
16
Installing and Configuring the BFG NVIDIA nForce 680i LT SLI Motherboard
PWR1 connector
Plug power cable
from system power
supply to PWR1
Card edge
Connector Pin Signal Pin Signal
1 +3.3V 13 +3.3V
2 +3.3V 14 -12V
3 GND 15 GND
4 +5V 16 PS_ON
5 GND 17 GND
6 +5V 18 GND
7 GND 19 GND
8 PWROK 20 RSVD
9 +5V_AUX 21 +5V
10 +12V 22 +5V
11 +12V 23 +5V
12 +3.3V 24 GND