How to choose your PC cooling system

CPU cooling relies on three measurable characteristics: airflow, maximum rotational speed and fan diameter. Each directly influences heat dissipation capacity and operating noise level. Kalyneo ratings position each product against current market references.

What to check

Airflow Airflow measures the volume moved by the system, expressed in CFM. The higher it is, the faster heat evacuates from the processor and case. On recent product sheets, the median airflow reaches 68.1 CFM, while high-performance models exceed 110 CFM and basic configurations limit themselves to 39 CFM. The rating extends when airflow increases. High airflow suits powerful processors or compact cases, where air circulates less naturally. Market median: 68.1 cfm

Maximum rotational speed Maximum speed, measured in revolutions per minute, determines cooling responsiveness during load peaks. Market models show a median at 2,025 RPM, the most efficient reach 3,000 RPM and the most modest cap at 1,600 RPM. High speed improves thermal evacuation but generates more noise. The rating favours high speeds. Systems with regulation automatically adjust speed according to temperature, avoiding permanent operation at maximum. Market median: 2,025 RPM

Fan diameter Fan diameter, expressed in millimetres, influences the balance between performance and silence. A larger fan moves more air at equal speed, allowing quieter operation. In the current market, the 120 mm format largely dominates, while premium models adopt 140 mm. The rating extends with diameter. Check that your case or radiator accepts the chosen size, as not all mounting points are compatible with large formats. Market median: 120 mm

Compatibility and installation Before purchasing, verify compatibility with your processor socket and available space in the case. Some systems require partial motherboard removal, others mount from the outside. Liquid cooling radiators require specific mounting points on the case. Heatsink height also matters: imposing models do not fit all cases, especially compact formats. Consult the maximum dimensions accepted by your configuration before choosing.

Benchmarks based on 30 recent market listings, collected on 4 October 2026.

What you get for each budget

Less than €25

Entry-level systems offer functional cooling with 120 mm fans, speeds around 1,600 RPM and modest airflow, suitable for processors with low power consumption.

€25 to €80

This range gathers most efficient solutions, with airflow close to 68 CFM, speeds reaching 2,025 RPM and sometimes 140 mm formats, sufficient for most desktop and gaming configurations.

More than €80

Premium models exceed 110 CFM and 3,000 RPM, with 140 mm fans, intended for very powerful processors, overclocked configurations or users seeking silent operation even under heavy load.

Frequent mistakes

Choosing an oversized system without checking maximum dimensions accepted by the case.

Neglecting socket compatibility, which varies across processor generations.

Prioritising only maximum speed without considering the noise level generated.

Forgetting to check the number of connectors available on the motherboard to power the fans.