Advantech AIMB-781 User Manual page 48

Active Processor Core
Use this to select how many processor cores you want to activate when you are
using a dual or quad core processor.
Limit CPUID Maximum
Setting this item to [Enable] allows legacy operating systems to boot even without
support for CPUs with extended CPUID functions.
Execute Disable Bit
This item specifies the Execute Disable Bit Feature. The settings are Enabled and
Disabled. The Optimal and Fail-Safe default setting is Enabled. If Disabled is
selected, the BIOS forces the XD feature flag to always return to 0.
Hardware Prefetcher
Hardware Prefetcher is a technique that fetches instructions and/or data from mem-
ory into the CPU cache memory well before the CPU needs it, so that it can improve
the load-to-use latency. You may choose to enable or disable it.
Adjacent Cache Line Prefetch
The Adjacent Cache-Line Prefetch mechanism, like automatic hardware prefetch,
operates without programmer intervention. When enabled through the BIOS, two 64-
byte cache lines are fetched into a 128-byte sector, regardless of whether the addi-
tional cache line has been requested or not. You may choose to enable or disable it.
Intel Virtualization Technology
This feature is used to enable or disable the Intel Virtualization Technology (IVT)
extension. It allows multiple operating systems to run simultaneously on the same
system. It does this by creating virtual machines, each running its own x86 operating
system.
Power Technology
Default is "Energy Efficient". User can set "EIST", "P-STATE", "C3","C6" and "Pack-
age C State Limit" under "Custom Mode".
AIMB-781 User Manual 38