I recently built my first PC, and the fans are much louder than expected—even when the system is idle. After checking the BIOS, it seems the Arctic Liquid Freezer III Pro 360's fans are responsible for most of the noise. The silent profile keeps them around 1700–1800 RPM at about 38°C, while a manual profile runs them around 1600–1700 RPM. Both seem unusually high for those temperatures, and the fans occasionally ramp up loudly for no obvious reason.
In Windows, HWiNFO shows CPU temperatures around 53°C, with a minimum of 45°C and occasional spikes up to 76°C. CPU usage is usually below 2%, although it briefly rises to around 9% when notifications or other background tasks run. I have not played any games yet and have mostly been browsing the web.
Is this likely a fan-control, wiring, or BIOS configuration issue? Could the fans be connected or configured incorrectly, or is this normal behavior for a Ryzen 9 7900X? My motherboard is a B850 Aorus Elite AX V2 WiFi 7, and the cooler is an Arctic Liquid Freezer III Pro 360.
3 Answers
Check how the fans are connected. If they are plugged directly into the power supply, they may be running at full speed and the motherboard cannot control them properly. They should normally be connected to a motherboard fan header or the cooler’s controller. Also verify that the header is configured for PWM rather than DC if the fans use a four-pin connector.
Keep adjusting the BIOS fan curve until you find a balance between noise and temperature. You can also use a Windows fan-control utility to test different curves while the system is running. Brief temperature and CPU-usage spikes from background tasks or notifications are normal, so the curve should avoid reacting too aggressively to every small spike.
1600–1800 RPM is quite high for an idle system. If the temperatures are staying reasonable, lower the fan curve manually. You could start around 400–600 RPM at low temperatures and gradually increase speed as the CPU or coolant temperature rises. A typical silent profile for this kind of cooler may be closer to 900 RPM at idle, depending on the fan model and control settings.
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