I think the question is self explanatory:
I have a server (running Linux) which has 2 CPUs with 2 cores each. I know how to turn off cores and fans pragmatically. If for example, I turn off both cores in CPU#2, I guess its fan is no longer required. It would be reasonable to turn it off as well?
Temperature of last week. Core0 (orange) & Core1 (yellow) of Cpu#2 were turned off 3 days ago. Core1(blue) of Cpu#1 was turned off 1 day ago. Still, the temperatures doesn't change: