AMD’s Zen 4 processors can display remarkable performance-per-watt once they’ve been manually tuned, or if you enable ECO mode in the system setup. You lose some multi-core performance, but the power consumption of the chip drops drastically. That could explain what we’re seeing with some leaked benchmarks for what is purportedly a Ryzen 7

Source: Hot Hardware – AMD Ryzen 7 7840U 8-Core Zen 4 Laptop CPU Breaks Cover In Benchmarks Looking Strong