Hey everyone, I've got a 4,1 Mac Pro (2009) and am needing to upgrade the RAM. I've only got 8GB in there now, which is paltry for my photoshop needs. My plan is to buy three 16GB sticks spread out over the time it takes to save for each one. However, looking down the road, I'm eventually going to upgrade the processor (as well as bumping the firmware to 5,1 for 6-core options and 1333mhz RAM speeds). Here's my question: Can I buy a 1333mhz stick of ram now? Will it run at 1066 until I upgrade the processor/firmware? Also, I understand that when using 16GB sticks, they need to be the same/matched part numbers. If I buy each of these, say, 6 months apart, will that be okay? Any help and advice is much appreciated!