For those of you with a Mac Pro, Mac Book Pro, or iMac, your Mac supports 64bit mode. Well, that's if your Mac is no more than 2 years old(i think). 64bit will make your Mac significantly faster, but it will use more power, so let that be known. Anyway, here's how you do it! If your Mac is on, reboot it Just before the Apple pops up, hold down '6' and '4' Hold the keys till the login screen or desktop You are now in 64bit mode! To make sure you were successful, click the at the top left of the screen, click 'About this Mac', then click 'More Info'. This will open System Profiler. Now, in the left column, click the 'Software' heading. Look for '64-bit Kernel and Extensions', if it says 'Yes', your in 64bit mode! If no, then no. Please Register or Log in to view images Good luck and enjoy!