One of the few highlights of the refreshed 27-inch iMac is the new SSD option for its second drive bay. This sure is good news for performance addicts carrying some spare cash, but with the 256GB SSD addition costing from $750, some may prefer the DIY route to save a few pennies for that gold iPad. Sadly, it won't be as straight forward as sliding in a new drive -- e-tailer OWC noticed in its teardown that you'll be needing a mounting bracket and a couple of cables that are only supplied with Apple's own SSD. That said, if you can find a way to secure the drive in the bay, all you'll need are a SATA male-to-two-female splitter plus a left-angled SATA connector cable, and then a way to partially remove the logic board to access the free port. Yup, it's as easy as really complicated pie.
AppleiMac 27-inch with Retina 5K display (late 2014)