You may have difficulties with the choice of a CPU, you will solve them by seeing the detailed test AMD Ryzen 9 3900 GeekBench 5 score multi and single core and understand is it a good processor or a bad one to buy, how powerful is this CPU. Here you can find all information from GeekBench 5 benchmark. A careful analysis of all the technical characteristics, to make it easier to understand, is made by the table. After reading the results this test and video, you can already make an briefed decision about do you need to buy AMD Ryzen 9 3900 or not.
All the number in the article above do not mean that you should be guided entirely by them and trust a simple comparison of these figures. Better to watch benchmarks video and read the opinion of of people who bought AMD Ryzen 9 3900 before deciding buy this CPU or not.