Why the obsession? I just recently installed 16GB (4x4GB) in my 2009 MP and it's fantastic. I haven't paged or compressed one time since I installed it. I've been using LR and PS simultaneously. If I had a triple channel configuration of 12GB (3X4GB) I would have most certainly paged out and compressed by now. I haven't seen over 12GB of usage so far. Currently sitting at 12.81GB of usage right now. Even if I had a super fast SSD I still want to prevent paging to reduce writes to the drive. I don't see any benefit what so ever. Am I missing something?