MSI MS-7242 - Manual (Page 53)

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BIOS Setup
PNP/PCI Configurations
Primary Graphics Adapter
This setting specifies which VGA 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. W hen 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.