can i convert a 3pin to use PWM?
and would i see any benefits it i could? (my current assumption is that the PWM lets the fan control how it handles loading the motor, so instead of undervoltage it might just turn things on and off rapidly. so there is no way to make a 3pin fan work based on PWM connectors if im understanding this right)

im kinda disappointed at my motherboard because it has a 4pin for the cpu, with a decent number of options for setting the speed, but it only works if all 4 pins are there. other system fan connectors do allow me to control the default speed, but only at 100, 75 or 50% and no dynamic tuning.

soon enough i might try to find a way to adjust my GT AP-15s via temperature, but i cant figure out the easiest, cheapest, or best way yet. (also it must fit in the case i have in my sig)