And once it's built in, it's definitely part of a generational leap, but it is unlikely history will consider add-ons like that in the same way.
Intel generations do exist but they would be tracked separately from console ones. When people say 'next-gen', other than vaguely meaning 'stuff in the future', the general assumption is that it refers to console generations. PCs don't really go leap by leap like that; they go up in gradual increments.
Which, btw, is an irritation on review sites and places like Gamefaqs, because the 'PC' sections there are becoming increasingly huge and unwieldy, containing all games over the last 15 years or so.