Why does Apple only approve of up to 16GB (4 x 4GB) RAM in 2009 Mac Pro? I have a 2.66 Ghz Quad-Core 2009 Mac Pro, which I believe is a 4,1 4GB RAM module is the sweet spot value-wise, but I am considering getting 8GB modules . . . 3 x 8GB = 24GB, which also maintains triple channel memory access. So I'll buy either 4 x 4GB = 16GB or 3 x 8GB = 24GB for using Final Cut Pro X, Motion, CS5 Master Collection (thinking about getting CS6) and playing around with DaVinice Resolve. Which would you recommend, 16 or 24? Also part of the decision process is possibly buying a new Mac Pro down the road in 6 months, if it comes out and the price and upgrades are worth it. Thanks for any feedback.