For example you are thinking about choosing a processor, you will be able to make a decision by looking at the Intel Core i7-6660U GeekBench 5 score multi and single core test and understand how powerful is this CPU, is it a good processor or a bad one to buy. Here you can find all information from GeekBench 5 benchmark. A thorough review of all the specifications, to make it easier to understand, is presented in the form of the table. After reading the results this test and video, you already be able to understand do you need to buy Intel Core i7-6660U or not.
All the number 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 of people who bought Intel Core i7-6660U before making a decision buy this processor or not.