OWC has also offered PCIe SSD upgrades for MacBook Pro Retina laptops from 2012 through early 2013. If you purchased a MacBook Pro Retina, you already shelled out at least $1,300 for the 13-in. model.

A new SSD inside an older iMac, MacBook, Mac mini, or Mac Pro will lead to much faster OS X performance, app loading, restarting, and file accessing.

Learn how you can upgrade the soldered SSD storage within your Apple MacBook from just 128 GB up to 2 TB of storage if you have the soldering ...

The MacBook Pro also benefits from lower SSD costs, with legacy 15-inch model upgrades selling for $200 and $600 for 512GB and 1TB, respectively, down from $300 and $800.

For more details, read our full review of the Apple MacBook Pro (Retina, 13-inch, Early 2015). The entry-model we tested in the above review featured 8GB of memory and 128GB flash drive.

According to a leaked Apple repair guide for the 15-inch Retina MacBook Pro, many internals including the SSD, I/O Board, Logic Board and even the bottom case have been updated to new parts.