60fps is the speed the game was designed to be played at, why the hell would you want higher?
also going on your logic, you would have to overclock the phenom to about 8Ghz (not possible) to get 100fps, at least with the i5 it would be possible.
but the AMD Phenom II X4 955 is also getting 60 fps,
all i want to know what fps will i get with Kingdom Hearts and
Shadow Of The Colossus
4GHz is highly achievable with Phenom II sure, but are you sure your cpu (which differ for each batch) could? not to mention other factor that could affect this (motherboard, ram, psu, cooling and yourself).
Just get the 2500K. Getting Phenom for emulator nowadays is is a waste of money and effort.
Intel CPU's are much better than AMD. There architecture, and SSE4 intructions are there. So better get an i5 2500K.