i just got a 5850 and i try to play section 8 and borderlands and i get this erreor message. This application has failed to start because physxcudart_20.dll was not found. Re-installing this applicatin may fix this problem. Well, it doesnt fix the problem. Is there any way i can put in my old gtx 260 and use it as a physx card since i have the ati hd 5850. Or what can i do to fix the problem.