Any efficiency comparison involving Apples chips also has to factor in that Tim Cook keeps showing up at TSMCs door with a freight container full of cash to buy out exclusive access to their bleeding edge silicon processes. ARM may be a factor but don't underestimate the power of having more money than God.
Case in point, Strix Point is built on TSMC 4nm while Apple is already using TSMCs second generation 3nm process.
Case in point, Strix Point is built on TSMC 4nm while Apple is already using TSMCs second generation 3nm process.