Quote Originally Posted by road-runner View Post
How much more?
Depends on which project(s) you're running. DDDT tends to do well with Ubuntu x64. If you are running all the available projects, a quad-core would probably get a couple thousand more points per day with Windows x64. Doesn't matter which version. The 64-bit versions of Vista, XP, Server 2003 & Server 2008 all do well with 64-bit clients.