In what ways can games be optimized for Intel? What is the sort of change that the game developers would need to make to increase performance on AMD?
https://software.intel.com/en-us/gamedev/
But also things like physics engines (eg. Havok, which was acquired by Intel and heavily optimized for Intel processors), etc.
And of course Intel's C Compiler is known to cripple AMD: http://www.agner.org/optimize/blog/read.php?i=49 And some/many games are compiled with ICC...