ASUS Arctic Square CPU Cooler Supports - Intel Core2 Extreme / Intel Core2 Quad; Intel Core2 Duo / Pentium processor family; AMD Athlon 64 X2/ FX; AMD Athlon 64/ Sempron PWM function automatically adjusts fan speed according to CPU temperature and delivers a quiet cooling operation Inner Fan Technology - The fan positioned inside the frame for maximum airflow and VRM shield guides cool air to critical components around the CPU for stable operation