Hi Guys and Gals I need some advices here. I've got MacBook Pro 6,2 (mid 2010) 15" 2.66 Core i7. It came with 4 GB RAM which I believe ran at 1333 MHz. I recently bought an aftermarket 8 GB upgrade. A buddy of mine bought this for me from Frys in the States. I live in South Africa. Sadly, one of the DIMM is faulty. Thus my Macbook is now running at 6GB but only at 1066 MHz. The packaging and the sticker on the DIMM says 1333 MHz. Is this some sort of Apple magic playing here? BTW, the DIMMs are made by Patriot Memory. So, I my question is as follow: Do you guys recommend 4 GB at 1333 or 6 GB at 1066? I appreciate your inputs..