Asus RAMPAGE IV EXTREME User Manual page 45

7. Slow Mode Switch
Slow Mode Switch is employed during LN2 benching. Some processors have a small
optimum temperature range to run at their highest frequency. Warmer or colder yields
instability at this frequency. For example, a certain processor may need -80̊C loaded
in order to run 5.8GHz, which means about -75̊C idle in order to stay stable at 5.8GHz.
Going colder or warmer crashes. It will however remain stable at slower frequencies
at much colder or warmer temperatures. Once it comes out of a heavy load while
transitioning over to a light load, when the temperature does not warm fast enough,
it may crash. To over-come this simply flip the switch over to "slow" the processor
instantaneously. Switching over to Slow-Mode during critical moments when
Temperature/Max Frequency alignment is off-synch saves you a lot of crashes, even
when trying to boot into the OS at cold temperatures.
ROG RAMPAGE IV EXTREME 2-21