How to compare two CPUs or GPUs

There are now websites which offer performance comparison between any two CPUs or GPUs. The one I like is CPUBoss for CPU comparison and GPUBoss for GPU comparison. In either site, you can also find out information about an individual CPU or GPU by searching for its name in the top search box. You can also sort all the CPUs or GPUs by their performance or other metrics by using the Sort option at the top.