This line of thinking is ridiculous. Unless you're running single core cinebench all day, I can't see how an FX (at least 6 core) isn't exactly like an i5/i7 in day to day tasks. At my last job I used an i7 3770 and did rendering, compiling, multimedia editing, and web browsing. I felt ZERO difference in responsiveness from my work desktop to my home desktop (FX-8350). The only time I could tell a difference is when I would be encoding videos and browsing at the same time. Encoding times seemed faster with the i7 but responsiveness was choppy. The FX was more responsive. User responsiveness is the most important metric for how "fast" a computer is. Having 6-8 threads available at all times makes for an immediate, albeit potentially slower response.
iPhones sure seems to feel a LOT faster than flagship Android phones despite lackluster hardware because the threading for UI is always the top priority. Having many cores available does that in Windows.