I don't know if anyone was wondering about Crucial memory modules for (in my case) imac 27", sold by Amazon and the ones sold directly from Crucial. Amazon ones cost $139,99 - part number: CT2C8GT3S160BM Crucial ones cost $163,99 - part number: CT4951624 I was wondering why directly from crucial are more expensive than Amazon's. I emailed crucial asking about the differences. That's the answer I got: "The parts you've referenced between the Amazon link and the link to our site are identical, the only difference lies in the part number for Amazon contains a "C" for Case Pack rather than the "K" which denotes Kit in our part number." So, what I understood was this, they are the same memory only changing the part number and amazon's are cheaper!