256GB SSD for MacBook Pro (Retina, 15", Mid 2015) Only: PCIe 4 Lane (x4) NVMe 8.0GT/s SSD Flash Upgrade - 2900MB/s Read, 1500MB/s Write, Requires macOS 10.13.x (High Sierra) or Later

Please Note: The 256GB SSD listed here is specifically for the 15-inch MacBook Pro with Retina display (Mid 2015) and the MacBook Pro must be updated to macOS 10.13.x (High Sierra) or later before installation of this drive. With macOS 10.13 (High Sierra), Apple enabled the 15-inch MacBook Pro with Retina display (Mid 2015) to be able to utilize this faster type of NVMe-based SSD. If your MacBook Pro is already running macOS 10.13.x (High Sierra) or later, then you are ready to go. You can verify the model of your MacBook Pro and check which macOS you're running by going to the Apple drop down menu at the upper left of your display and selecting "About This Mac".The highest performing internal storage upgrade ever created for the MacBook Pro (Retina, 15-inch, Mid 2015): 256GB NVMe Interface, 4 PCIe lanes (x4), 8GT/s and clocking in at 2900MB/s Read and 1500MB/s Write! Your MacBook Pro is a high performing Mac requiring the very highest performance PCIe-based flash drives available today. The MCE 256GB PCIe-based NVMe Flash SSD Upgrade Solution for the 15-inch MacBook Pro with Retina display (Mid 2015) was designed to take advantage of the super-fast 8GT/s PCIe architecture present in that machine. This upgrade includes all the tools necessary to perform the upgrade as well as an illustrated installation and upgrade guide. Everything you need to upgrade your machine is included! Compatibility 15-inch MacBook Pro with Retina display (Mid 2015) running macOS 10.13.x (High Sierra) or later. Verify your model of MacBook Pro by clicking on the Apple menu (at the upper left of your screen) and then selecting the top item "About This Mac"Package Contents MCE 256GB PCIe-based NVMe Flash SSD for 15-inch MacBook Pro with Retina display (Mid 2015), MCE Drive Installation Tool Kit Illustrated Installation and Upgrade Guide

• Please Note: Your MacBook Pro (Retina, 15-inch, Mid 2015) must be updated to macOS 10.13.x (High Sierra) or later before installing this SSD. With macOS 10.13 (High Sierra), Apple enabled the 15-inch MacBook Pro 2015 to utilize this faster type of NVMe-based SSD. If your MacBook Pro is already running macOS 10.13 (High Sierra) or later, then you are ready to go. MCE 256GB PCIe-based NVMe 4 Lane (x4) SSD Flash Drive utilizing all 4 PCIe data lanes and operating at 2900MB/s Read & 1500MB/s Write!
• Fastest SSD Created Specifically to take advantage of the faster 8GT/s PCIe architecture present in the MacBook Pro (Retina, 15-inch, Mid 2015). NVMe Interface - The Next Generation of SSDs designed to take advantage of SSD's low latency, parallelism, and makes your Mac faster overall because it uses less CPU cycles than your previous SSD for storage management!
• Highest-performance drive created specifically for the MacBook Pro (Retina, 15-inch, Mid 2015). Automatic TRIM support. Boot Camp compatible.
• At 256GB (250GB of usable capacity) work the way you want to and lessen, or eliminate altogether, your dependence on lower performing, expensive external drives. 5 Year Warranty!
• Compatibility - Machine: MacBook Pro (Retina, 15-inch, Mid 2015) only. macOS Version: compatible with macOS 10.13.x (High Sierra), macOS 10.14.x (Mojave) and all future macOS versions applicable to your MacBook Pro (Retina, 15-inch, Mid 2015) as well as Windows installations using Apple's Boot Camp or virtualization software. Verify which MacBook Pro model you have and which macOS you're running by going to the Apple menu at the upper left of your display and selecting "About This Mac".