IEI Integration NANO-9452 v4.02 - Manual (Page 144)

NANO-9452 EPIC Motherboard
Page 126
 Clear NVRAM [No]
Use the Clear NVRAM option to specify if the NVRAM (Non-Volatile RAM) is cleared
when the power is turned off.

No D EFAULT System does not clear NVRAM during system boot

Yes System clears NVRAM during system boot
 Plug & Play O/S [No]
Use the Plug & Play O/S BIOS option to specify whether system plug and play devices
are configured by the operating system or the BIOS.

No D EFAULT If the operating system does not meet the Plug and Play
specifications, this option allows the BIOS to configure all the
devices in the system.

Yes This setting allows the operating system to change the
interrupt, I/O, and DMA settings. Set this option if the system
is running Plug and Play aware operating systems.
 PCI Latency Timer [64]
Use the PCI Latency Timer option to specify the PCI latency time. The latency time is
measured in units of PCI clock cycles for the PCI device latency timer register.
Configuration options are:
 32
 64 D EFAULT
 96
 128
 160
 192
 224
 248