I never tried vista on my q6660+550. So i did a fresh install 64bit ultimate, install the new drivers from nvidia, not the titan ones. And wow, this os is nice. I tested jericho and apb reloaded and they run much smoother compared to win7. i guess for my q6600 vista is the better choice , so i am going to use this over win7 now. games seems to run about 15% faster over win7 on my computer.