Hi Guys, Sorry to ask a question that's possibly been addressed many times, but I've tried a number of searches and haven't been able to get a definitive answer. I'm about to buy a Mac Pro 12 core and I need to know whether it's better to stick to 2s, 3s or 4s when grouping ram. I'm either going to go for 6x4 gig sticks, or 8x4 gig sticks. I also have a Mac Pro Quad, bought earlier this year. At the moment it has 3x4 gig sticks but I'd really like to add another 4 gig stick to max things out (this is for loading samples, not for application performance) - is this going to cause any problems?. Thanks in advance. Andy.