I have been getting completely opposing and conflicting opinions about the need to boot into the 64-bit kernel to access more than 32 GIGs of system RAM (I have 48 GIGs installed). If I see in "About this Mac" that there are 48 GIGS installed does that insure that my system can access all of it? I am currently booted in 32-bit kernel and my "About this Mac" does report seeing all 48GB. Does this end the debate/discussion? After encountering constant crashing while trying to run with the 64 bit kernel, I returned to the 32-bit mode and was surprised when I saw (w 10.6.7) that all my RAM shows up.