I was wondering what peoples observations of hardware performance havebeen between Intel and amd CPU's in Skyrim and Nvidia and AMD's GPU's?

Currently I have a Phenom II x4 with a R9 270x and I was wondering if I switched to an i7 4790K with an equivalent Nvidea graphics (of same power as the R9 270X), would the difference in performance be noticeable?

Also I'm wondering the same about Oblivion.