Had no issues with CPU temps before 6.4.1...no CPU temp will climb 25C degrees in 3 mins or so when scrubbing a volume. And yes, I know the system is no longer supported especially with configure below, but this was all working fine on 6.4.0
Haven't heard of this problem. Let's wait to hear if other community members who uses the same legacy NAS with 6.4.1 Firmware have experienced the same.
I have a Pro Pioneer on 6.4.1 with a Noctua 120mm fan on the back and a non-PWM Noctua 80mm fan on the CPU (with a 5v voltage regulator) with no problems at all.
If switching fans, pay attention to the RPM, static pressure and CFM figures, and make sure that there numbers are equal or greater than the stock fan. Lots of fans are designed for quieter operation and don't push the same amount of air. In a big PC case that isn't so much of an issue; in a smaller NAS case, it is very important.
In my experience I found the Noctuas didn't cool my Pro BE systems as well, even when using the better-specced NF-S12A 120mm fan; but YMMV.
I have installed the following and the CPU fan speed does not increase when the CPU temp increases. I am going to 6.4.2 Beta 1 and see if the issue is fixed.
Delta 80x15mm PWM Fan #EFC0812DB 48.8 CFM 3800 RPM
Panaflo 120 x 38mm Ultra High speed 3-pin Fan #FBA12G12U-1BX 115 CFM 2750 RPM
