those benchmarks are with an intel i5 2550k processor and its also overclocked this game really hates on AMD for some reason i would recommend an intel processor to play arma 3 the AMD FX 6300 is a decent budget cpu but if you want optimum performance get an intel processor i would recommend an intel i5 4770k if you can afford it. And to answer your question unlikely will you keep 30fps at all times on even high settings for arma 3 with that build just because of the Amd processor.
but yet again i could be wrong as their has been updates to Arma 3 since February so the performance with Amd processors on Arma 3 could be better now but knowing the Arma series i highly doubt they have optimized the game any more.