SHA-512 is faster only on Skylake derivatives up to Comet Lake and on older Intel Core CPUs.
On Intel Atom starting with Apollo Lake (2016) and on Intel Core starting with Ice Lake (2019) and on all AMD Zen CPUs (2017), SHA-256 is implemented in hardware and it is much faster than SHA-512.
On Intel Atom starting with Apollo Lake (2016) and on Intel Core starting with Ice Lake (2019) and on all AMD Zen CPUs (2017), SHA-256 is implemented in hardware and it is much faster than SHA-512.