No point in buying PWM fans if they don't function.

Before I consider replacing or adding more fans I'd like to figure out if there is a workable solution other than DC. The stock Intel cooler for my i5 8400 and two 140mm case fans that came with the CM Master Pro 3 case are cheap but I don't suspect they are the root issue. DC settings for the case fans work as displayed.

The other three non-full speed options (Normal, Silent, Turbo) display considerably more realistic temp reactive curves which are disregarded in use for the same 98% base fan speed. AC Converter / Motor Drive 2 PWM 100 VOO Bios Control Circuit 5 PMS PM7 a second current subtractor outputting a sixth current by subtracting the fourth. Both case fans lock into 98% as the optimized, and now lowest manual, setting. In current BIOS this option is replaced by 'Optimize all fans' which sets all fans to PWM > Manual. I briefly looked around before updating from the version it shipped with and seem to remember it allowed setting the PWM fan speed based on cpu/mb/HDD temp individually or as a composite. First build and the fan settings in BIOS seem strange.

Bios pwm