So I have an nVidia GTS250 I want for physx and an AMD6870 for Graphics. When I plus the gts250 into PCIe slot 2 and AMD into slot one, only AMD shows up as detected, BUT when I Swap and make AMD in slot 2 and gts250 in slot one, they both show up just fine, but everything uses gts250 graphics wise by default... I am having the worste time making AMD card my primary and nVidia secondary. Any Help? Im on win7 Enterprise 64bit