Prolimatech Megahalems Rev B. Intel CPU Heatsink (LGA 775/1156 / 1366) (AM2/2+/3 Mounting Kit Required) Minimal air resistance between fins allowing best balance between noise and performance in range of 800-1200RPM Heatpipes are lined up in a straight line to prevent air back draft allowing air to easily pass through the heatsink body Wide fins with mathematically calculated thickness to maximize best air-to-surface cooling rate Uniquely designed, easy-to-install socket 775 and 1366 retention mechanism to increase cooling ability. Separate ARM-02 Mounting Kit required for use with AM2 AM2+ and AM3 Motherboards Easy to apply, high grade thermal compound, a perfect sidekick to all Prolimatech heatsinks