Hello! To begin, I have been strictly an ATI user for the last 4 years. So I am very unfamiliar with Nvidia's control panel and driver packages. I am trying to enable Hybrid Physx using a 5850 and an 8800gt. I was under the impression that the Beta 257.15 Nvidia drivers currently on their web site still allowed the hybrid configuration with ATI cards (because there were so many complaints when they took it down?) So! I installed the 8800gt, installed the Beta 257.15 drivers, installed the lasted PhysX system software (09.10.0224). Restarted my machine. I assumed I would have to enable PhysX, but there is not category I can find for it under the control panel or in the start menu. My monitor Is hooked up via DVI from the 5850. There is not connection from the 8800gt. I went to Screen resolution, Hit Detect, Two blank screens show up captioned "Another display not detected". I choose one of these two and select available display output from 8800gt; then I select "try to connect anyway with VGA." I then extend the display to "both" monitors. Run GPU-Z, and PhysX is not Checked. Thought these were the correct steps. Where did I go wrong? Thanks for the help.