I ordered a brand new 27" Retina iMac. It comes with 8 Gb memory, so I'd like to add some more. I'd like to know, if this is a suitable set of RAM? iMac's hard drive prices are just ridiculous, so I ordered mine with only 256 Gb SSD. I've planned to take off another 256 Gb SSD from my old Macbook, and use it as an external hard drive. Is it sensible, or is it silly to use SSD externally? Can I use this as a case for the drive, or how should I mount it? Of course I could also buy a hard drive dock, but it wouldn't fit to my drawer, and I'd like to keep my desk neat and clean.