aside from many/most of the backside thermal contact pads having anywhere from 25 to 50% of the thermal contact bumps not being there... Make nice jacks for pushing the board away from the sink. 
The big silver dots are smushed (as they should be) thermal bumps. Most are not present at all. Folks who still have miners unreturned can easily unbolt the heatsinks and verify this. If the bumps were such a problem to make properly then even a thin copper foil shim would have done the trick.
The big silver dots are smushed (as they should be) thermal bumps. Most are not present at all. Folks who still have miners unreturned can easily unbolt the heatsinks and verify this. If the bumps were such a problem to make properly then even a thin copper foil shim would have done the trick.