high end amd cpu vs intel

[buffyvpsfan]

trying to build a cheap but powerful steam machine that can stream all my games from my desktop but also play the best emulator out there, dolphin!! i've heard that theres a huge gap between intel haswell and current amd cpus?? just how much of a gap is there or should i just stick with an i5 and overclock it and call it a day. advise needed??

one requirement: it needs to run twilight princess very well