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CPU model does not matter, except in the the case where you would try to re-use the CPU-related power management SSDT of another CPU. That would not work. Now, don't get confused. Pike R Alpha's SSDT generator script is ONLY for CPU power management. Nothing else. So, if you wanted to modify other items such as USB ports or dGPU via SSDT, you need to create/add further tables. HWMonitor works with FakeSMC plugins. There are several of them: ACPISensors CPUSensors GPUSensors LPCSensors SMMSensors to name those that accompany Rehabman's latest versions of FakeSMC. These plugin kexts can be located alongside FakeSMC or inside a PlugIns subfolder within FakeSMC. If you only have a subset of them, the info displayed by HWMonitor will be reduced accordingly.

Fan noise/permanent spinning is not specific to OS X/macOS. It's the same with other operating systems such as Windows and I believe it results from recent BIOS updates.