Fans not reaching 100% speed under 100% load

arvz

Prominent
Apr 1, 2017
3
0
510
Just put together a new PC, running Ryzen 7 2700x on X470 Taichi using the included Wraith Prism cooler, and it seems at 100% load and over 80 degrees the fans never go up to 100% speed.

I did a Prime95 stress test (Small FFTs), on HWiNfo64 CPU temperature peaked at around 81 degrees celcius (tdie, not tctl) and the wraith prism peaked at around 2750 RPM. In BIOS I've got the fan profiles set to standard mode, and in standard mode I think around 80 degrees is when it should hit 100% speed.

If I set the fans to full speed in BIOS, it definitely goes at 100%, 3500+RPM, so the fans are definitely capable going up to that speed. The L/H switch on the fan is set to H.

The fans definitely get slightly faster compared to idle, but not by much. What could be going on here?
 


I can set custom profiles, but the profile it's set to now, the standard profile, is set to go to 100% at 80 degrees, the problem is it's not doing that