The Firepower 1000 series has an embedded x86 CPU with some minimal acceleration but not a dedicated crypto chip like the higher end models have. As you move up to the 2100 series you get an NPU (still more general purpose but with crypto acceleration) and finally on the 4100 and 9300 series dedicated crypto acceleration processors.
See Cisco Live US 2019 presentation BRKSEC-3035 "Firepower Platform Deep Dive" for more details.