I have a 2.4ghz MacBook that I run Fusion on for AutoCad and on the OS X side of this gets bogged down. Also know that having a 2gb/4gb combo will disable dual channel so those who have upgraded to 6gb have you seen a improvement and is it worth it? Currently running Windoze 7 Ultimate 64bit for AutoCad 2010 64bit w/ 1gb ram allocated for it in VMWare w/ 3D turned off. This leaves me 3gb for OS X but i have to have Mail, RSS Reader and iTunes turned off. Any suggestions?