I am getting ready to upgrade from my 2008 Mac Pro to a refurbished 2010 Mac Pro. It will have 3.2GHz Quad-Core Intel Xeon "Nehalem" (4-Cores; 8-Threads), which is perfect for my needs, but I'm unsure about what memory to use. Here are my choices: 16GB (4x 4GB) of 1333MHz DDR3 ECC 24GB (3x 8GB) of 1333MHz DDR3 ECC 32GB (4x 8GB) of 1333MHz DDR3 ECC I would be fine with the 16GB, but it's in the back of my mind that some configurations are better than others (I don't know why). So, I would like to know what some of you have to say about this. And, please keep in mind that I'm technically ignorant, meaning if you tell me something like "three dimms are best", I won't have a clue what you mean.