ARM’s new cortex-X4 big core boasts some very decent improvements in ST performance (~20%) over the previous X3 in the likes of the Snapdragon 8G2. However, power consumption has also increased accordingly, so ST efficiency isn’t noticeably improved.

It’s actually considerably worse efficiency.

+17.5% ST perf for +40% power in SPEC2017Int

About as expected going from 6-wide to 10-wide decode and increasing clock speed…