Isi ihe dị iche n'etiti ARM na X86 bụ nhazi, usoro ARM na-agbaso usoro nhazi RISC (Reduced Instruction Set Computer) ebe nhazi X86 bụ CISC (Complex Instruction set Architecture). Nke a pụtara na ARM ISA dị mfe ma ọtụtụ ntuziaka na-arụ ọrụ n'otu okirikiri elekere, ebe ntuziaka CISC na-adịkarị mgbagwoju anya, na-ewe ọtụtụ okirikiri CPU iji mezuo ntuziaka ọ bụla.