Let's say you can't decide which processor to buy, you can make a decision after reading the detailed benchmark AMD EPYC 7643 Cinebench r23 score single and multi core and understand is it a good CPU or a bad one to buy, how powerful is this CPU. Here is useful information from Cinebench r23 benchmark. A thorough analysis of all the specifications, to make it easier to read, is made by the table. After reading the results of all test and video, you can already make an briefed decision about do you need to buy AMD EPYC 7643 or not.
Although it should be understood that all the figures in the article above do not mean that taking them into account you should fully trust a simple quantitative comparison. Better to watch benchmarks video and read the opinion of real owners of AMD EPYC 7643 before deciding buy this processor or not.