Hello I'm considering the purchase of a MBP Retina, on which it's impossible to add RAM. I thought that the 64bit version would give me access to as much RAM as I wanted, but the guy in the shop, a certfied Logic Pro specialist, tells me that it's not true, that the 64bit version has access to 8 GB RAM max, and thus that instead of ordering a MBP with 16 GB which would come in 3 weeks I might as well get the 8 GB version which is available now. . Who's right ? And are there other reasons for me to get more than 8 GB ? Thanks !