We just have to look at the world of bitcoin mining to see that custom fabricated ASICs would wipe the floor with general purpose CPUs for this kind of task.
Intel 3930k = 66.6 Mhash/s AntMiner S9 ASIC = 14,000,000 Mhash/s
Intel 3930k = 66.6 Mhash/s AntMiner S9 ASIC = 14,000,000 Mhash/s
So that's only 74074 Mh/s per ASIC.
Granted, that's still wiping the floor...