One of the main reasons to buy Vista is support for the next version of the Direct3D API, DirectX10. It was apparent from the moment that the first public betas of Vista were released that games were going to be challenging. While Chris Donahue, manager of Microsoft's Games for Windows group, assured us that Microsoft tested thousands of games for Windows Vista, apparently there were a few that failed the tests (he did not comment as to which games those were). Classic first-person shooters, such as Half Life 2 and Doom 3, are having serious issues when being played in Windows Vista. Some games will not run at all, while others will crawl along at a seriously decreased framerate. The main causes of this are a lack of good (or for some video cards, WHQL certified) hardware drivers, the complexity of Windows Vista, and a lack of entry-level/midrange cards that can really handle DirectX10.