Hello, I personally have installed several i7-4770 CPU on 27” late 2013 iMac and it work flawlessly. Now i´m wondering if the “S” variant would do it too (that is why i got here) and it think they are.[br]
So I don’t have a precise answer for your specific question, but at least i got you close to it, as i mentioned I have done the 4770 upgrade successfully. Now i’m about to know the results when i receive the 4770s I just purchased.