I am a radiologist using the 7020 SFF with an integrated graphics card for reading cases from home. I've been having slow image scrolling/lagging lately and the hospital thinks it may be the graphics card. I wanted to upgrade the card but dell says i can't remove it because it's integrated. Is there a way to add an external graphics card to the 7020? I dont see a thunderbolt plug. Anybody tried this on the HMDI or other ports on the pc? thanks.