Hi, There are not any validated GPUs for this system. However if you keep it under 25 watts it may work. It should automatically disable the onboard video if a GPU is connected. 
Hello, I just ordered a Poweredge T30. I don't need huge graphics performance, but I have two monitors with DVI-D connectors that I need to connect. My plan is to get a PCIe graphics card for that purpose, something around 25 Watts to stay within the limits of T30's the power unit. Is it easy to deactivate the internal graphics chip in the BIOS once I plug in a graphics card? What else do I have to keep in mind? This will be a Linux system.
Poweredge T30 video card - what to know?