Thermaltake TMG i3 Intel Socket LGA1156 Core i7/Core i5/Core i3 CPU Cooling Fan-CLP0555. Frameless fan: Differs from the traditional framed fans by reducing the backpressure and turbulence produced by the air hitting the side walls of traditional fans.As a result, the frameless fans are much quieter than the traditional fans. Unique fan blade design will also produce less noise due to reduced backpressure. Enter bearing: The oil from the traditional sleeve bearing will evaporate over time and allow more friction between in the bearing unit itself, producing noise and shortening the lifetime of the fan. The enter bearing design allows extra oil capacity to elongate the life of the fan and reduce noise levels. ? PWM controller: The fan supports Intel PWM FSC specifications which allows the fan to be automatically adjusted via the motherboard BIOS. According to the temperature of the CPU, the fan will spin at whatever speed is necessary to reduce unnecessary noise. ? Multi-orientation heat sink Design.