Fan is only spinning at 80% even though my CPU temps are hitting 65-70 °C

[K_Furbs]

It's brutally hot in the bay area this week and I'm having issues with my CPU idling/web browsing/watching VLC (pretty low power stuff) at 60+ °C. I have my CPU fan set in BIOS to smart cool to 50 °C so the fan should be running at 100% when I hit mid 60s but it's still running at 80% even when I break 70. Are there additional settings I need to mess with in BIOS to make the fan more effective? The cooler fan is plugged into the 4-pin CPU fan header so pwm should be fine. My cooler should cap out at 2500 rpm but OpenHardwareMonitor is telling me it's only at 2000 rpm.

Hardware:

LIAN LI PC-A04B Case (yeah it's a small case)
MSI 760GMA-P34(FX) Micro ATX AM3+ mobo
AMD FX 83203.5GHz 8-core cpu
CRYORIG C7 40.5 CFM CPU Cooler
Radeon Sapphire HD7850

Edit: I went back into BIOS and set the minimum fan speed to something like 86% (it was a weird number) but the fan is still apparently spinning at 2000 rpm, only 80% of its max speed. Do fans just not hit their advertised max speed or is something screwy?

Edit: Oddly enough, today it's been jumping between 1900 and 2000 rpm. Still lower than it should be at 86%. Is OpenHardwareMonitor less accurate than I'm assuming?

 

[the nerd 389]

Fan speed ratings are usually accurate to +/- 15-20%. I've found that most manufacturers will overstate the maximum fans speed by around that much.