I know that Penryn Mac Pros are just around the corner, and I have been reading on these forums that it won't support DDR3 RAM. But just today, I saw on Alienware's website here that they will have DDR3 in that computer and as far as I can tell it is, in fact, a penryn based computer. It also says it supports DDR3 Ram with clock speeds of 1333 and 1600 Mhz. I just wanted to know if someone with more technological knowlegde could explain this one to me. Thanks!