I have no issues in UT3 with PhysX either because it hardly uses it, rag doll and flak? Not too complex. Try GRAW2, I have played it at LAN parties where every single person there had the same issues on cards ranging from 9600's to a 295. Cryostasis is the same way, enable advanced PhysX and your frame rate drops to 12 with horrible mouse lag. In most situations I've seen other games accomplishing the same things in software using Havok or proprietary engines with next to no performance impact, so that's my complaint. Anyway, keep your silly AA comments to yourself, it has nothing to do with physics, and I have nothing against sacrificing a proportionate frame rate for visuals. Hell, I have been using super sampling more than AA recently anyway, which murders frames, so I am the last person to bitch about frame loss unless there are MUCH better alternatives at hand.