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While Solid Works does support multi-threading, it is better to use more single-core powerful CPUs. The reason for this is because of task dependencies. There could be multiple processors working on tasks simultaneously but if one processor is waiting on another to finish its task, then it must wait until its done. Therefore, faster cores > more cores.
Side note: I did consider the new processors from AMD (Ryzen) however due to the above statement, and benchmarks from other users, I decided to go with Intel. (Benchmarks).
Possible Specs for New PC:
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