CPU Core Temps are sometimes spiking above 90 degrees when under load during games. Noctua NF-A8 PWM will not spin properly when plugged into CPU Fan header, spins fine with SYS Fan header. so the fan is not defective. Stock fan runs fine. There are no fan controls in the BIOS and SYSFAN doesn't work either. Is the PWM version the wrong version for a CPU fan? Should I replace the entire stock heatsink/fan/thermal paste with a Noctua L9i or will I just have the same problem when it is plugged into the CPU Fan header?