At this point there is no way to run the Ultra in SLI with the latest drivers. So, if you do the mod in the article, you are stuck with old drivers. With SLI this is a particular problem, because nVidia will be adding supported games over time. There is some suggestion in the article that it would be possible to do additional board mods to over come this. I'd expect those to be much harder than just using a number 2 pencil.