Has anyone done this successfully? I just ordered a Mac Pro quad and am wanting to upgrade the CPU. The price for a W3680 is the same as a W3690, so I figure I would get the faster of the two. Also, if I purchase DDR3-1333 memory, will this CPU utilize it and clock at 1333MHz? After talking with someone at OWC they told me that a six core processor will never see the 1333Mhz so it was not work paying the extra for the memory. This does not sound right. Anyone?