Just a heads up, a 64bit OS with 4GB of RAM will run at about the same speed as a 32bit OS with 2GB.
How did you arrive at this conclusion? Are you suggesting that a 64-bit OS uses RAM 50% less efficiently than a 32-bit OS? If anything, a 64-bit OS with 2GB of RAM will be faster than a 32-bit OS with 2GB of RAM when it runs 64-bit optimized applications, and about the same speed when running a non-optimized program.
I would recommend the 64-bit version if you don't want to have to upgrade again in a year when 4GB of RAM starts becoming more useful for games and 64-bit executables become more mainstream. The main downsides to 64-bit Vista is that some older hardware makers didn't make 64-bit drivers for their hardware and that old 16-bit programs won't run. As a gamer with brand new hardware, neither of these situations should apply to you. If you want to be on the safe side, you could always go with the retail version which includes both 32-bit and 64-bit, and allows you to re-activate Vista as many times as you want.
EDIT: Every chip is different, so there is no guarantees on how far you can OC your E6750. However, I've been able to get mine stable at 3.8ghz and I could probably go to 4ghz if I had a bit better cooling (I have an aftermarket cooler that I got for free that is only a bit better than the stock cooler). I currently run it at 3.6ghz 24/7 and it is rock solid.
Edited by stettybet0, 21 February 2008 - 02:31 PM.