Welcome to the forums!
Your Gigabyte GA-965P-DS3
has an Intel P965 Chipset
This chipset does not have any integrated graphics, but your board does support any PCIe graphics card (powersupply dependent).
If you are asking what GPU you currently have, download GPU-Z
and find out.
If you are asking which new GPU works best for you, please post back your intended usage, budget and detailed information about your PSU including your combine +12V amperage.