I was actually surprised as well how well you could run both types in one computer. I had a 460 and a 6970 together at the same time, and I ran FAH and BOINC on both cards without a problem. 
You do need drivers for both though, but I didn't run into any conflicts. At one point I even had two monitors connected to the 6970, and on to the 460 and that worked fine too, at least for extended desktop.
You do need drivers for both though, but I didn't run into any conflicts. At one point I even had two monitors connected to the 6970, and on to the 460 and that worked fine too, at least for extended desktop.










