Originally Posted by doyll
so it's not a fan problem but a PWM % signal problem?
What is your PWM % signal at 440rpm?
Obviously that is assuming the scale in you control software is close to accurate.
Some give the control as rpm % to temp .. and very few motherboards actually use the rpm signal. They use heat from chips and then adjust voltage to speedup / slowdown fans, but have no idea (and could care less) what the fan rpm is. All they is increase / decrease fan voltage or PWM signal % as temps increase / decrease in component (at whatever ratio we select)..
ASUS's AI Suite 3 has a very advanced fan control software indeed, very similar to Aquaero's one if you happen to know it.
When you first launch it, it tests each fan from min speed to max speed and it draws a curve with % (PWM or current) on the Y-axis and temp target on the X-axis.
Then it allows you to customize the curve as you want and helps you with a small table containing the RPM value corresponding to each 10% increase in pwm/current (like 20%=800rpm, 30%=1000rpm and so on so so forth).
The Cpu fan header also has the aforementioned "CPU Extreme Quiet" setting which extends the pwm range of the fan, bringing for example my DRP3's 120mm from the standard 800rpm at minimum pwm down to 440ish.
I really love AI Suite 3 and it's one of the reasons why I only buy ASUS boards
EDIT: here's a quote direcly from X99 Deluxe's page that explains what I was saying
"Fan Xpert 3 supports hardware-level PWM/DC combo mode for both the CPU and case fans. It even can reduce the CPU fan speed to below the default minimum, for extra-quiet and power saving operation during light loads
"Edited by marn3us - 1/26/16 at 2:13pm