AMD Radeon RX 480 Polaris 10 Features 2304 Cores, Radeon RX 460 Polaris 11 Features 1024 Cores - 2.8x Increase in Perf/Watt
All this talk about Big Navi and Ampere and I'm still stuck with my grandfather's Polaris cards because AMD and Nvidia budget options saw literally no improvement in the past few years. :
The AMD Radeon RX 480 Review - The Polaris Promise - PC Perspective