About 4 months ago I purchased a Nehalem QC Xserve. I have it running Mavericks with server tools, etc. I noticed that it has 2 open PCI slots on the back and I was wondering if I could fit a low-profile graphics card in there. I also know that the on-board nvidia card is connected via MXM, could I upgrade that? If I can't upgrade via PCI or MXM it isn't a big problem, but I would like to see a more powerful gpu inside it.