I would suggest doing a bit of Googling, but here are some answers. As to what they really mean for your motherboard, I don't know.
1. LDT Voltage Select,
That's the voltage for the Hypertransport bus
2. PMU function
Power Management on a Mac, no idea on a PC
3. K8<->SB HT Speed (bandspeed of the links xmitter),
Hypertransport bus speed
4. K8<->MCP55 HT Width (bandwidth of the links xmitter),
Hypertransport bus width
5. Onboard Super IO,
Probably specific to your mobo, but I imagine it has something to do with USB/Firewire/ETc.
6. AC Media Interface,
7. Reset Config Data (whether the system automatically distributes DMA & I/) addresses each time the PC is turned on)
Resets all DMA and IO ports every boot. Probably a good idea to turn this off.
8. Maxium Payload size (max. TLP payload size for PCI-E).
Data packet size over the PCI-E interface.