I bought the Corsair memory (16GB) from Fry's a couple of weeks ago for $109. However, I bought part number CMSO16GX3M2A1333C9 vice CMSA16GX3M2A1333C9. I called Corsair and the tech told me that in reality they were they exact same memory from the same production line, but the latter (Mac) part number has just been specifically tested to work with the Mac. Well, my thought was, since my MBP uses the same intel processor as any other laptop, for the most part, I'd go ahead and take a chance and buy the cheaper version. Immediately after install, I ran extended diagnostics with zero issues. I've been running it for a couple of weeks now and so far (knock on wood) it has been purring along like a charm. I know it was a bit of a risk, but I figured if it was really the same memory from the same line, the odds were good (not perfect but good) that it would work just fine. So far so good.