Thermaltake Silent 1156 CPU Cooler To achieve the most effective thermal conductivity the Thermaltake Silent 1156 CPU Cooler is equipped with a PWM (Pulse-Width Modulation) fan that actively communicates with processor and automatically adjusts the fan speed between 800 ~ 1700 RPM to achieve best performance to noise ratio; ensuring proper cooling for different system loading. While 6mm heatpipes are commonly used in today’s CPU cooler design, Thermaltake engineers designed-in not one, but two heavy-duty 8mm heatpipes to accelerate heat removal from the processor. The result is a more thermally efficient cooler with a compact and stylish form factor. With the Thermaltake Silent 1156 CPU Cooler, heat is transferred away from processor through heatpipes, it is evenly distributed across high-density stacked fins implanted on Silent 1156 for effective dissipation. To achieve the most effective thermal conductivity, each Silent 1156