If you can't decide which processor to buy, you can make a choice by looking at the Intel Core i7-6900K Cinebench r23 score single and multi core test and decide how powerful is this processor, is it a good processor or a bad one to buy. Here you can find useful information from Cinebench r23 benchmark. A careful review of all the specifications, so that it can be easier to read, is presented in the form of the table. After looking at the data of joint test and video, you can already make an informed decision about do you need to buy Intel Core i7-6900K or not.
Although it should be realized that all the figures in the article above do not mean that taking them into account you should entirely trust a simple quantitative comparison. Be sure to watch the testing video and read the reviews of of people who bought Intel Core i7-6900K before deciding buy this processor or not.