If you are unsure whether or not you have a PCIexpress x16 open, give us the make/model of the motherboard and we can confirm for you for sure.
Wow, quick reply. The mobo has PCIe 2.0 and the Gfx card comes with 3.0, as I've never dealt with gaming computers (let alone any type of customization) this is gibberish to me. However, going off of what you said its definitely fine. What PSU would you recommend for a budget?