120mm vs 140mm fans: size vs airflow
**120mm**: Fits most cases, cheaper ($15–30), adequate cooling. **140mm**: Quieter at same airflow (lower RPM), overkill for most cases, expensive ($30–60). For gaming: 120mm fans are standard. 140mm is diminishing returns.
CFM vs RPM vs dB: what actually matters?
**CFM (Cubic Feet per Minute)**: Airflow volume. Higher = more cooling. 50–100 CFM typical. **RPM**: Fan speed. Higher RPM = louder. 1000–2500 RPM typical. **dB (Decibels)**: Noise level. 30dB = whisper, 50dB = normal, 70dB+ = loud. Good ratio: High CFM, low dB. Avoid high RPM fans (loud).
Budget vs premium fans: Noctua vs Arctic vs Corsair
**Budget (Arctic)**: $15–25, decent performance, okay noise. **Premium (Noctua)**: $40–60, best performance/noise ratio, 10-year warranty. For gaming: Arctic fans are fine. Noctua if you prioritize silence.
Best budget case fan: Arctic F120 (~$20)
Reliable, good CFM, quiet enough. Most popular budget option. Solid for intake/exhaust.
Best premium case fan: Noctua NF-A120 (~$50)
Quietest at same airflow, excellent build quality, 10-year warranty. Overkill for most but nearly silent operation.