The annoying thing about this, is it wasn't present two main beta patches ago.

Something they changed must be triggering this crash.
If I were Bohemia I'd be looking at the 0.74 changelist.

The disabling PPAA suggestion that colinm478 mentioned above does absolutely nothing.
And nothing in there is even related to PhysX anyway.

Running two HD7950 here.

Another of my friends running the same cards is getting constant crashing too, and another friend with two HD5870. While another with two HD6850 hasn't had a single PhysX_x86.dll crash.

It's all very strange.