Asus M2N-SLI Deluxe - Manual (Page 135)

ASUS M2N-SLI Deluxe -2
You can also set the AI Gear modes by clicking the AI Gear icon on the Windows
taskbar.
• When AI Gear is enabled, the system will automatically optimize the CPU
and chassis fan speed according to the system loading.
• The AI Booster (AI NOS) and AI Gear functions cannot be enabled
simultaneously.