The Apple A13 Bionic features an Apple-designed 64-bit six-core CPU implementing ARMv8.4-A[1] ISA, with two high-performance cores running at 2.65 GHz[5] called Lightning and four energy-efficient cores called Thunder. The Lightning cores feature machine learning accelerators called AMX blocks. Apple claims the AMX blocks are six times faster at matrix multiplication than the Apple A12's Vortex cores.