SR2002, As Dell doesn't recommend 3rd party graphics cards, the T110II does support it. Since we dont recommend the use of them, we don't actively test the different manufacturers. Now I did come across an older post where they say they used a NVIDIA GeForce G210 512MB DDR2 PCI Express Video Card in the T110 II and it worked. To answer your next question, adding and upgrading parts to the server will NOT void your warranty, but added devices that were not obtained through Dell will not be covered by the warranty. Let me know if this helps answer your questions.
Hello, I recently purchased a t110 ii with the Xeon E3-1230v2. I bought it for self learning and to use as workstation/homelab server. ( I got for a price lower than any equaluivalent workstation/desktop offerings).  I searched on google for some answers and could only find posts dating 2012-2013.  I was wondering if anyone has experience with compatible graphics cards that were launched this year or last year.  I understand that the PCIe connector can only support upto 8x power 25w ( as read on other discussions). Are there any current generation graphics cards that I could use. I'm not planning use this for gaming, the main use will be for virtualization and for using it as a work station once in a while.  Secondly as far as the HDD/RAM and warranty policy from Dell, I was planning using my own sata hard drive and possible upgrade ram later down the line. Will opening the chassis for upgrades or installing any third party components void the warranty of the machine even if those components were the reason of the failure.  I would have purchased from Dell but unfortunately my student budget didnt permit me.   
Poweredge t110 ii question: graphics card and HDD