I agree with philhoole, Vue is the only app mentioned in this thread that realy draws multithreaded. All others are drawing in one thread and are switching through their views. The driver developers (of cards that are mostly used as gaming cards) are not very concerned about this, because there are only very few apps using this feature. If you can afford it, buy a "real" OpenGL Card like Diamonds FireGL cards. Intresting stuff can be read here - specifically the performance of a 4-view rendering under the benchmark section. This is partly based on the multithreaded GL-driver and the optimization of the FireGL cards for professionell CAD workstations. Have a nice day ! Arthur