I currently have a dual Xeon system on a server board which I am running off of its on-board graphics (Matrox G200), with the CPUs doing the rendering. I am planning to get a dedicated GPU for this system, but it will not be doing any Cycles rendering at all. I am wondering if the GPU plays a big role in viewport performance (ie modelling, particles, simulations, navigating around 3D space etc) or if I could just skimp on the GPU.
So, the two cards I have in mind are the GT 720 and the GTX 750ti. Will viewport performance be significantly better with the 750ti or will the 720 be enough?