Hi, A W3680 is on it's way to put in my 2009 Mac Pro. In the research I read that the W3680 will recognize 1333 mhz ram. At the moment the Mac Pro has 12gb 1066 mhz ram. Will I notice a big difference between the two? And when I upgrade the ram to say 16gb can I mix 1066 with 1333? And at last is 16gb enough for major FCP X editing and bit of Motion and After Effects? Thanks.