MSI NVIDIA MS-7504PV - Manual (Page 45)

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BIOS Setup
PnP/PCI Configurations
Primary Graphic’s Adapter
This setting specifies which graphics card is your primary graphics adapter.
PCI Latency Timer
This item controls how long each PCI device can hold the bus before another takes
over. When set to higher values, every PCI device can conduct transactions for a
longer time and thus improve the effective PCI bandwidth. For better PCI performance,
you should set the item to higher values.
PCI Slot1/ 2 IRQ
These items specify the IRQ line for each PCI slot.
IRQ Resource Setup
Press to enter the sub-menu, and the following screen appears.