Hi, Started using Aperture 3 trial and it seems I need more memory than 4GB. Doing enough adjustments to a RAW photo and eventually activity monitor shows that all 4GB of memory is in use and the system becomes really slow - and Aperture impossible to use. But having looked at this (http://guides.macrumors.com/Understanding_Intel_Mac_RAM), it seems my January 2009 MacBook Pro (Late 2008, I assume?) 2.4 GHz doesn't support more than 4GB of memory? Well, 6GB, but I've never seen 3 GB memory modules - do they exist? Or is it worth losing the "dual channel" by installing 4GB + 2GB? Had I only went for the 2.66 GHz version I could have had 8GB of memory, right?