The last time you bought a PC, did you really spend any time deciding what processor to get with it? I bet not much if any.
The processor is one part of your PC that is impractible to upgrade in a PC today, the solution is just to get another PC.
I’m often asked if someone’s 4 year old PC will work well enough to run the latest Practice Management application or CBCT imaging app. Often my answer is “It will work, but it won’t be the same as on a newer PC”. “But it’s only 4 years old!” is the usual comment they plead in reply.