Let me help you out with this.
The board you have supports up to PCI 2.0. If the graphics card is PCI 3.0 it is backwards compatible meaning that it should work in your system.
I recommend you updating the bios in your system before connecting the video card. It is important to say that the board supports the card but it does not necessarily means that it is compatible with the card since the board is quite old now. So my best recommendation is as mentioned before, update the bios and check for a firmware update for your card.