I found this question and answer really ironic, especially when you consider the source of the answer.
What is the fastest Vista laptop (as of Nov.7, 2007) as reported by PC World? Mac Book Pro.
http://www.pcworld.com/article/id,136649-p...ks/article.html
Fastest: Apple MacBook Pro
The fastest Windows Vista notebook we've tested this year is a Mac. Try that again: The fastest Windows Vista notebook we've tested this year--or for that matter, ever--is a Mac. Not a Dell, not a Toshiba, not even an Alienware. The $2419 (plus the price of a copy of Windows Vista, of course) MacBook Pro's PC WorldBench 6 Beta 2 score of 88 beats Gateway's E-265M by a single point, but the MacBook's score is far more impressive simply because Apple couldn't care less whether you run Windows.
Further in in the article they compare gaming on an Alienware laptop and the MBP comes out something like 10-15frames faster.