http://www.pcper.com/article.php?aid=354&type=expert
I decided to take the retail version of Windows Vista Ultimate, got the latest drivers from both AMD and NVIDIA as of Friday and began to spend my weekend testing. What is important to note here is that my intention is NOT to compare the ATI Radeon cards against NVIDIA GeForce cards -- rather it was to compare the gaming experiences provided by ATI and NVIDIA on both Windows XP and Windows Vista.