It depends on resolution, fps and quality preset used. i7-3770k is no slug either, used to be Intel's top of the line consumer CPU. Unlocked multiplier you can OC it to 5 GHz if you are lucky. I have an overclocked i7 5820k 6-core CPU (x99 platform!) and it struggles to do 1080p 60 fps encode with OBS (x264) on anything higer than veryfast quality.