Zogrim

As mentioned in this thread, there are no physics calculations in ARMA 3 that can be GPU accelerated effectevely (or can't be calculated on GPU at all, like vehicle physics or ragdolls). But that's ok. Hundrets of games are using PhysX SDK on CPU only, and there is nothing "bad' or "disadvantageous" about it.

Ehm, just a notice - there is no such thing as PhysX 1.x. The engine from which PhysX has originated was called NovodeX (2002-2004). And "early" PhysX SDK (2.3) was released somewhere around 2005, I don't think that was something VBS2 was using. But I presume that switch from PhysX SDK 2(.8) to SDK 3 was indeed time and resources consuming, as their API are quite different.

It really depends on implementation - APEX itself is well optimized for CPU/consoles, but so far was used mostly for GPU accelerated eye candy (which one is meant to run perfectly on GPU only). Point is, if devs will announce that ARMA 3 will use, for example, APEX Destruction module to add destructible buildings to the battlefield, there will be no reason to panic. Also, do not worry about main physics layer - like character controller, vehicle physics, ragdolls - this types of calculations do not support GPU acceleration in PhysX SDK, so it will run on any CPU/system in any case