DFI PT630-NRM User Manual page 58

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BIOS Setup
Execute Disable Bit Capability
When this field is set to Disabled, it will force the XD feature flag to always
return to 0.
Intel HT Technology
Enable this field for Windows XP and Linux which are optimized for Hyper-
Threading technology. Select disabled for other OSes not optimized for Hyper-
Threading technology. When disabled, only one thread per enabled core is
enabled
Active Processor Cores
This field is used to enter the number of cores to enable in each processor
package.
A20M
Enable this for legacy operating systems and APs.
Intel(R) SpeedStep(tm) Tech
Enables or disables GV3.
Intel(R) TurboMode Tech
When Enabled, Turbo mode allows processor cores to run faster than marked
frequency in specific condition.
Intel(R) C-STATE Tech
When enabled, CPU idle is set to C2/C3/C4.
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