@ DFTricks: actually Vista takes less memory than XP, if you don't believe me? If you run the demo in XP and Vista and you have the system information in the top right corner, which you get by typing something in the console of which I forgot. Once you see the information it shows that Vista uses less memory than XP, also true DX10 uses more dynamic lights than XP under the fake DX10. If you look at the screenshots of this website which have comparisons of both and it has the information of memory usage and such you willl see that theres a big difference. Bear in mind guys that XP has already got working drivers whereas Vista doesn't so once those come out I am pretty sure that the very high settings on Vista will surpass XP by a long shot. http://www.crysis-online.com/?id=449 here is the website. Look at the screenshots and you will see a difference in a lot of things.