I will soon be buying a quad mac pro (after WWDC) and I will also be upgrading it to a 6 core model using the thread here. I also plan on upgrading the memory by slowly putting in 4 gigs at a time. The problem it that the memory that it comes with in the quad runs at 1066 where memory for the hex runs at 1333. I plan on buying from OWC. If I buy 1333 ram will it throttle down to 1066 until all modules are switched? Or will it not run properly? My last question is about Lion. If it is not completely released at WWDC will I get upgrade pricing assuming my Mac Pro comes with Snow Leopard? Thank You! EDIT: Sorry about the title, I know it sounds idiotic.