i used to have an integrated pentium D in my computer with the gtx 275 and still got a decent 60ish fps on servers with high brickcount such as Pecon's or Zix's(sorta). Then recently I swapped it out for an i7-4790 8core, and the fps increased to the 200-300 range on those servs. Unfortunately I cant access my computer right now, so I cant test it on Sylvanor's Seattle City like LeetZero did.
That's called bottlenecking and is going to happen with any game
When I upgraded from an phenom 2 965 to an i7 4770, I could bump BF4 settings from medium to ultra.
The CPU is important, but it's not more important
i7-4790 8core
There is no such thing
the i7s support hyperthreading, which give 2
threads per core, this isn't the same as 8 cores