Datasheet

Technical Reference
67
Table 28. ATX12V Power Connector
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12 V 4 +12 V
Table 29. Alternate Power Connector
Pin Signal Name
1 +12 V
2 Ground
3 Ground
4 +5 V
2.8.2.3 Add-in Card Connectors
The board has the following add-in card connectors:
•
One PCI Express x16 connector supporting simultaneous transfer speeds up to 8 GBytes/sec.
• Two PCI Express x1 connectors. The x1 interfaces support simultaneous transfer speeds up to
500 MBytes/sec.
• Four PCI Conventional rev 2.2 compliant local bus slots. The SMBus is routed to PCI
Conventional bus connector 2 only (ATX expansion slot 6). PCI Conventional bus add-in
cards with SMBus support can access sensor data and other information residing on the
Desktop Board.
Note the following considerations for the PCI Conventional bus connectors:
• All of the PCI Conventional bus connectors are bus master capable.
• SMBus signals are routed to PCI Conventional bus connector 2. This enables PCI
Conventional bus add-in boards with SMBus support to access sensor data on the boards. The
specific SMBus signals are as follows:
 The SMBus clock line is connected to pin A40.
 The SMBus data line is connected to pin A41.
NOTE
The PCI Express x16 connector is configured to support only a PCI Express x1 link when the
Intel GMA900 graphics controller is enabled.