A5 is around 121mm, Sandy Bridge i3 is only around 131mm. Intel is 32nm, A5 is Samsung 45nm process. i3 probably would be at least 5 time faster than A5. The statemet of "ARM天生就是高效的" is no longer true. Even ARMH CEO said recently that ARM chip will be very "competitive" to Intel's(He used to use the word "better", not competitive).