Exactly. When I was at Intel (working on the Mesa 3D drivers for Linux) we would routinely get reports that performance was less than on Windows and ultimately

Exactly. When I was at Intel (working on the Mesa 3D drivers for Linux) we would routinely get reports that performance was less than on Windows and ultimately determine it was because on Windows the thermal limits would be set to e.g. 45W but on Linux we'd be stuck at 35W.