PWM fan control lets the board raise fan speed only when the CPU needs it, which balances cooling against noise. The Skeleton Matrix 360 White's fan runs 800-2400RPM under PWM, so a sensible curve keeps idle sound low. Test it under load in BIOS.
A fan that runs at full speed all day is loud, and a fan that never speeds up lets the processor run hot. PWM fan control sits between those two problems. It lets the board raise fan speed only when the load asks for more airflow, so the case stays quiet on a light afternoon and still cools a long gaming session.
PWM control lets the motherboard vary fan speed with temperature, so airflow rises under load and noise drops at idle. The Skeleton Matrix 360 White's fan runs from 800 to 2400RPM under PWM. The cooler costs R1,199 including VAT.
PWM stands for pulse-width modulation. The board sends a control signal that sets how long each pulse lasts, and the fan converts that signal into a speed. A fan on a PWM header can run anywhere in its range instead of only at one fixed speed.
The Skeleton Matrix 360 White's fan spans 800 to 2400RPM. At 800RPM the fan moves air quietly, which suits an idle desktop. At 2400RPM it moves far more air, which is what a radiator needs when the processor is pinned for an hour. The range is the reason PWM control matters for this cooler: a fixed-speed fan would have to be tuned for one of those two extremes.
A fan curve is the rule the board follows. It maps a temperature to a fan speed, so the fan starts low at idle and climbs as the processor warms. A gentle curve keeps the fan near its lower speeds for most of the day and reaches full speed only near the top of the temperature range.
Set the curve in BIOS on the fan control page. Start with the default curve, run a 15-minute load test, then watch both the RPM and the processor temperature. If the processor climbs too fast, steepen the curve a step at a time. If the fan roars while the processor sits cool, flatten it.
Keep the pump on its own header and check its behaviour too. A pump held at full speed adds noise even when the fan curve is perfect, so the pump's setting is part of the same balance.
Balance is not a setting you can read off a label. It shows up in use, so test it with a game or a benchmark that loads the processor for at least 15 minutes. Listen from where you sit, and note the RPM and temperature at the end of the run.
If the room is warm, the test matters more. In a South African summer without aircon, the same curve can run hotter on a 30C afternoon than on a cool evening, so test on the warmest day you can, not the coolest. A curve that holds in that heat is the one to keep.
The CPU coolers category has AIO options, and the case fans category lists the fans that run on the same control logic.
Pulse-width modulation. The board sends a control signal, and the fan converts it into a speed inside its range.
It runs from 800 to 2400RPM under PWM, which covers a quiet idle through to full airflow under load.
A flat speed is loud at idle or weak under load. A curve follows the processor temperature, which balances noise and cooling.
Run a load test of at least 15 minutes, then check the RPM and processor temperature at the end. Test on a warm day if the room runs hot.
Ready to pair a quiet fan curve with the right cooler? Browse Evetech's CPU cooler and case fan ranges, then set the curve in BIOS once the build is running.
Pulse-width modulation. The board sends a control signal, and the fan converts it into a speed inside its range.
It runs from 800 to 2400RPM under PWM, which covers a quiet idle through to full airflow under load.
A flat speed is loud at idle or weak under load. A curve follows the processor temperature, which balances noise and cooling.
Run a load test of at least 15 minutes, then check the RPM and processor temperature at the end. Test on a warm day if the room runs hot.
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