Dell Latitude 5420 Owner's Manual page 238

Setting: All
Intel® Allows you to
SpeedStep™ enable or
disable the
Intel
SpeedStep
feature.
Default
Setting:
Enable Intel
SpeedStep
C States Allows you to
Control enable or
disable the
additional
processor sleep
states.
Default
Setting: The
options C
states, C3,
C6, Enhanced
C-states, and
C7 options are
enabled.
Limit CPUID Allows you to
limit the
maximum
value the
processor
Standard
CPUID Function
will support.
Default
Setting:
Enable CPUID