to this rig, buy a $5 PCIe extension cable for the primary PCIe 16x slot to connect one GPU to the motherboard so the monitor can talk to the rig via this GPU (instead of going through the motherboard's DVI port). If you plug in a GPU to the board, it blocks two 1xPCIe ...
Motherboards - C116DDR4CMS 16GB (2X8GB) DDR4 17000 2133MHz NON ECC DIMM Memory Ram Upgrade Compatible with Dell® Xps 8900 Desktop / Special Edition - B107DDR4CMS 16GB (1X16GB) DDR4 21300 2666MHz Non ECC DIMM Memory Ram Upgrade...