I am looking for an Nvidia PCI express 1x or PCI card capable of running Physx at a decent clip. I have a an Asus Maximus Formula board and 1 Sapphire 5850 card. I plan on running a second 5850 in Crossfire once prices drop so I don't want a standard PCIe card for Physx. I have 2 available PCI slots and 1 PCIe 1x placed in between the 2 PCIe x16 slots but the only thing I can find in PCIe 1x is ATI cards on the Egg. Would a 9500 GT or even a 9400gt 512mb suffice for Physx? Would the PCI slot affect performance?