PCIE 2.0 is just a generation. New one is PCIE 3.0 (only for top videocards it will need)
But we are talking about PCIEx lines: it can be 1,4,8,16.
As you said - your mobo have PCIEx1 and PCIEx16.
In slot of PCIEx16 you can fit any PCIE videocard.
Nvidia GT 630 will fit your motherboard.
Question closed.