I ran HWMonitor while my computer was basically idol and it displays my 2 case fans running at +9000 RPMs and +23000 RPMs...? My GPU fan shows 1200 RPM, which seems at least reasonable. Any ideas on what causes these gross miscalculation?
More abouthwmonitor speed problem
Do you have your case fans plugged into your motherboard??
If not, it is showing false readings from the motherboard, so don't worry about it than.