It seems to me that in the "good old days", it was pretty easy to pick a processor for a PC build, or when buying computer from a dealer. You essentially picked depending on the processor speed and/or the number of cores, depending on what you thought you needed.
These days, we have moved away from raw processor speed as a metric, and we now have (I feel) a less-than-obvious collect of names and letter qualifiers. Intel in particular seems to follow this paradigm, and I find myself relying on articles like this from Makeuseof, to give me some useful perspective.
Here is a look at the differences between the Intel I3, I5 and I7 and there various flavors (too many choices, if you ask me).
|Image from Makeuseof|