If you wanted to open up your 2012-13 iMac 27" and install a PCIe drive, would any one work? I know the slot is there. There seems to be a ton of them listed on ebay for sale, and the majority of the sellers do not list the iMac as one of the compatible units. Not to mention, some of them quote 500/400 speeds but the speeds the preinstalled Apple drives get are around 700+. I am referring to stock Apple/Samsung drives being sold. Any info would be greatly appreciated.