Erwähnt wird das es in ArmA1 schon erste Ansätze gab.
Da es aber seit Beginn in ArmA2 drin ist, würde ich eher davon ausgehen das momentan bei den Beta Patches viel hiermit herumjongliert wird:
Zitat von Rendering
Rendering is still the part of the game which takes most of the CPU time in ArmA, more than simulation or AI. To significantly optimize it, we have evaluated two possible approaches:
*blub*
What we eventually ended up with is a hybrid approach, which uses a worker thread for rendering, but some important inner loops are made concurrent across multiple cores.