Hello. I am planning to build a system for graphic design purposes: Core 2 Quad 2.40 ghz with 4 gigs of ram. I won't be able to use Vista as the main OS. I will use XP Pro SP3 32bit. Can I improve a XP pro SP3 system by adding 4 gigs of ram? Can I set 2 gigs for the OS and 2 gigs for Apps? I think I read somewhere that this can be done. But I'm not so sure right now. This link says 4gb: http://support.microsoft.com/kb/555223 Any help will be appreciated. Willy.