Any PCI-e x4 physical slot will do. x1 and x2 will work too. The problem is that the card is x4 big and x4 electrical, and while electrical doesn't matter (PCIe scales down and up really well, you can run anything at x1 if you wanted to, even x16 cards work at x1) it does matter if the card fits. So a x1 or x2 (I'm not sure if x2 even exists) will work, but only if the slot is open at the end.
So, if we check your system it should have PCIe slots, and thus it will work.