Fans & Cooling Systems

Category overview

Cooling decides how much real performance the rest of the build can deliver. A fast CPU or GPU that runs into thermal limits will throttle, regardless of its specifications. The right cooling combination keeps the system at a safe temperature under load and at a reasonable noise level the rest of the time.

What this category covers

Case fans in 80, 92, 120, 140 and 200 mm sizes; CPU air coolers from low-profile to dual-tower designs; closed-loop all-in-one (AIO) liquid coolers; custom loop components such as pumps, blocks and radiators; and high static-pressure server-grade fans for rack equipment.

How to choose cooling

Size the cooler to the actual power draw

Match the cooler's rated capacity to the CPU's real-world power draw under sustained load, not just to the marketed Thermal Design Power (TDP). A cooler rated at 150 W will struggle on a chip that pulls 200 W under all-core work.

Choose air or liquid based on the case and the workload

Air coolers are simple, reliable and quiet at moderate loads. AIO liquid coolers move heat away from the CPU socket and can handle higher sustained power, at the cost of more components that can fail and slightly higher noise from the pump. For most office and workstation builds, a quality air cooler is enough.

Distinguish airflow fans from static-pressure fans

Airflow fans move large volumes of air through open spaces and suit case intakes and exhausts. Static-pressure fans push air through restrictive surfaces (radiators, fine dust filters, dense heatsinks) and suit AIO and custom loop radiators. Using the wrong type makes the system louder for the same temperature.

Key features to compare

Fan size and mounting

Larger fans move more air at lower speeds and so run more quietly than smaller fans for the same airflow. Server fans tend to be smaller (40 to 80 mm) and faster, which makes them louder by design.

Bearing type

Sleeve bearings are cheap and quiet but wear faster, especially when mounted horizontally. Fluid dynamic and magnetic levitation bearings last longer and stay quiet over time.

PWM versus voltage control

Pulse-Width Modulation (PWM) fans use a four-pin connector and can be ramped smoothly by the motherboard. Three-pin fans run at a speed set by voltage. PWM is the more flexible option for modern boards.

What to check before buying

• Does the CPU cooler support the motherboard's CPU socket?
• Will the cooler fit in the case (height for air, radiator size for AIO)?
• Is the fan size matched to the case mounts (the most common standard is 120 mm)?
• Does the use case prioritize low noise, high airflow under load, or both?
• For replacements: does the new fan match the existing connector type (3-pin or 4-pin PWM)?

Frequently asked questions

Air cooling or liquid cooling for a workstation?

For most workstations, a high-quality dual-tower air cooler matches the cooling performance of a 240 mm AIO with fewer points of failure. Liquid cooling makes more sense when the CPU power draw is very high, when the case has limited clearance for a tall air cooler, or when the build aesthetic calls for it.

How many case fans do I need?

A balanced setup usually has at least one intake at the front and one exhaust at the rear. Adding a top exhaust helps when the system runs warm or includes a top-mounted radiator. More fans only help if the case has good filtering and the fan curve is tuned; otherwise the noise rises faster than the temperature drops.

Will an AIO cooler last as long as an air cooler?

A well-built AIO has a typical lifespan of five to seven years, limited by the pump and the fluid. A quality air cooler can run for ten years or more, with the only worn part being the fans. For long-life office systems, air cooling is generally lower-risk.

Why are my server fans so loud?

Server chassis use small, high-static-pressure fans that spin at high speed by design. The rate ramps with internal temperature. If the noise is excessive, check the inlet temperature, clear any dust filters, and verify the fan curve in the BMC (Baseboard Management Controller) is not set to a more aggressive profile than the workload requires.

Can I mix different fan brands and models?

Yes, mechanically and electrically the connectors are standard. The downside is that each model has its own noise profile and ramp behaviour, so a mixed set rarely sounds as clean as a matched one. For balanced setups, use the same model for fans on the same surface.