I have seen comments from people using two graphics cards, such as “I use one for OpenGL, and the other one for Cycles rendering”. I have two graphics cards supplied in an HP Z210 workstation; a Quadro 400 and a Quadro 4000. The 400 can’t do Cycles (compute capability 1.2 only, needs 1.3+), so I’d like to use the 400 for driving my two monitors, and use the 4000 only as a Cycles ‘engine’. However, as soon as I start a GPU render (with just the 4000 selected in Blender System Preferences) my monitors’ response slows down, in any application. After a minute or two Windows asks me if I want to turn off some interface features!
So is this normal? In Blender, how can I actually setup the 4000 only for GPU rendering (not other duties), so it doesn’t interfere with the rest of my system while its rendering?