Wally: the fact remains that the 8800GTX is trash on Windows. It's obvious you're a troll, but it's well known how many problems there's been with NVDA drivers on Vista and XP. Apple tends to stay a little behind the curve because of driver stability problems which are unacceptable on OS X, but gamers tend to live with. What's the top GPU you can get in any Dell workstation? I assure you it's not the 8800GTX.
Maybe *you* should read up before posting with your ass.