Intel Desktop Board D975XBX Technical Product Specification
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2.7.2.2 Add-in Card Connectors
The board has the following add-in card connectors:
• Primary PCI Express x16 (electrical x16 or x8) bus add-in card connector; one connector
supporting simultaneous transfers up to 8 GBytes/sec
• Secondary PCI Express x16 (electrical x8) bus add-in card connector; one connector supporting
simultaneous transfers up to 4 GBytes/sec
• PCI Express x16 (electrical x4) add-in card connector; one connector supporting simultaneous
transfers up to 1 GBytes/sec. This connector can also be used for PCI Express x1 add-in cards.
• PCI Conventional (rev 2.2 compliant) bus; two PCI Conventional bus add-in card connectors.
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 both PCI Conventional bus connectors. This enables PCI
Conventional bus add-in boards with SMBus support to access sensor data on the Desktop
Board. 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.
2.7.2.3 Auxiliary Front Panel Power/Sleep LED Connector
Pins 1 and 3 of this connector duplicate the signals on pins 2 and 4 of the front panel connector.
Table 29. Auxiliary Front Panel Power/Sleep LED Connector
Pin Signal Name In/Out Description
1 HDR_BLNK_GRN Out Front panel green LED
2 Not connected
3 HDR_BLNK_YEL Out Front panel yellow LED
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