So turns out a GT640 single slot is a nice card for X-Serve 3,1. Bootscreen and full x16 support, fits inside, etc. But I really need to work on MXM GPUs in the MXM slot. And best (only) way to do that is in Windows. Can't be in a virtual environment, needs to be real deal. From my searching I can't find that this every happened, yet I can't imagine that it isn't possible. Putting working Win installed disks in just goes to black. Did anyone every accomplish this?