Sorry, you got an amd cpu, that's by definition not a good cpu, when it comes to emulation.
For emulators like Dolphin, you need a lot of single thread performance, which all amd cpus lack. Sure some old intel cpus are as bad as amd ones, but those are not considered good either.
The AMD FX-4100 seems to have the same single thread performance as the Amd Phenom II X4 940, so it would only be faster if it runs at a higher clock.
Last but not least, don't get crazy ideas about buying an 8 core amd cpu. Dolphin uses mostly 2 threads, if you add the gpu driver thread, the lle audio thread(when using lle audio) and background stuff, you come to the conclusion that you want a fast quad core cpu. If you add any more cores than that, Dolphin is not going to run any faster, not even something like 1%.
For emulators like Dolphin, you need a lot of single thread performance, which all amd cpus lack. Sure some old intel cpus are as bad as amd ones, but those are not considered good either.
The AMD FX-4100 seems to have the same single thread performance as the Amd Phenom II X4 940, so it would only be faster if it runs at a higher clock.
Last but not least, don't get crazy ideas about buying an 8 core amd cpu. Dolphin uses mostly 2 threads, if you add the gpu driver thread, the lle audio thread(when using lle audio) and background stuff, you come to the conclusion that you want a fast quad core cpu. If you add any more cores than that, Dolphin is not going to run any faster, not even something like 1%.