Ducky welcome to the forums.
From what I can see it has one of three possible video cards (based on looking at the general download page for the 530S),
1. Intel onboard
2. An ATI card
3. Nvidia card
Seeing as you say you're not sure go here, Dell System Information / Dell Warranty Extensions & Upgrades / Dell Warranty Status
and use the service tag number from your computer to find out which one it came with (assuming it hasn't been changed since the computer was bought).