Nvidia and ATI – longtime rivals who do not play nice together. Although having both ATI and Nvidia hardware inside a PC is unlikely, there's now clear evidence trouble happens when you put the two together. Those with the very rare configuration of having an ATI GPU for rendering graphics and a Nvidia chip for processing hardware PhysX will find themselves unable to compute. Anyone running Nvidia driver version 186 will find PhysX acceleration disabled when ATI hardware is part of the system. (source: slashgear.com)
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