Factoring uses a different program which, while it is utilized by SOB, the improvements and updates have nothing to do with the SOB team. If you wish to discuss running Prime95(the program I'm talking about) on both processors, I suggest you head over to http://www.mersenneforum.org/ and post in THAT forum. Even better, do a search for the thread "Sneak peek." The next version of Prime95, which is discussed in that thread, will have multi-threading from one window. No more having to have more than one instance of that little red box in your system tray.Originally Posted by Glenn119