Did you know that Intel is actually one of the crappiest CPU companies on earth? Amazing fun fact isn’t it? bet you are wondering right?
Intel cannot survive outside a state sanctioned monopoly which X86 effectively is. Terms per AMD if they go bankrupt is its IP cannot transferred and all rights go back to Intel being the sole provider of X86 now that IBM gave up the race.
Look at ARM, Intel cannot to day compete with Qualcomm, intel fails each and everytime they try. Because ARM licenses their rights to any company that wants to make an ARM CPU so there is mass competition there hence the incredible rate at which mobile power is increasing at, the desktop has never ever had pleasure.
With that said, the best CPU to buy for the PC is indeed intel. However I opted for the $70 AMD 760K Quad Core CPU @ 4.1GHZ stock, when I use unreal engine and it has to cook etc and render anything that takes long, all 4 cores light up to 100%.
means that AMD is actually a pretty good deal when it comes to UE4 development. AMD shines when something is heavily multi threaded, infact you might even find the FX 8350 to be faster than the locked haswell i5. Because the 8350 has 8 cores.
The question is if Unreal uses all 8 of those cores? I cannot say for sure but I am willing to assume so. What you should do is buy the FX 6300 because I am pretty sure UE4 uses 6 cores for rendering. You will get a FX 6300 at less than half the price you would pay for an i5 and it would give the same return in speed as the $200 i5.
It does not make sense to spend money on a 4 core i5 when UE4 uses 6 cores at 100% for cooking etc. A FX 63000 will give you the same speed as a haswell i5 for less than half the price. It will be near identical in performance.
AMD stinks when it comes to the likes of Arma 3 and DayZ stand alone.