Hi I have a Gigabyte Brix Pro model number GB-BXi5-4570R, and as the model number suggest it is equipped with an Intel Core i5-4570R desktop class CPU,I installed 8GB of DDR3 1600 MHz SODIMM RAM and a Crucial 250GB msata SSD. It also as Intel Iris Pro 5200 GPU. I use this pc for work mostly running 3D Animation/Rendering software such as Maya 2016, I program using Android Studio etc and for the size I am very impressed with it so far. However I also play World of Warcraft and Heroes of the Storm on it on Low settings,as the Iris Pro graphics aren't very powerful. I was wondering whether I could purhcase a GTX 750 Ti, which uses no external power and install it on an external pci-express slot. Would that work at all? Would I need an external PSU anyway?