What were you watcing ? i3 beats FX-6300 alot more than 6%
Programs that people would run in the backround need RAM not CPU power, unless he will be doing video editing, streaming, recording
And if you dont know i3 has hyperthreading so it basically acts like quad core thats why he is just a little bit behinde i5
And dont forget he is building PC for ARMA 3 and if you look at the benchmarks. fx-6300 is getting more than 30fps, less than i3