I have interactive cloth and all that stuff. Smoke looked the same... Regardless, the particles were the only thing I actually noticed even if there was other stuff going on.
Enjoy the PhysX while it's relevant. :p Pretty soon all devs will be using ACE on AMD cards/PS4 for physics.
Core i5 2500K @ 4.8 GHz || 16 GBs 1600 MHz DDR3 || Sapphire Radeon HD 7970 || Dual 128 GB SSDs