Add additional chassis cooling with a 6mm high flow case fan This 6cm x 2.5cm (5 RPM) Computer Case Fan helps prevent computer systems from overheating, thereby increasing efficiency and stability. The fan features a TX3 connection and a built-in tachometer that sends RPM signals to your motherboard - a high-performance solution that can help avoid overheating and system failure. The StarTech.com Advantage - A dual ball bearing design ensures reliability and longer life - A built-in tachometer allows for easy monitoring of the fan performance - Higher performance fan with Increased air flow for warmer environments or higher performance components