The Sonnet M.2 4x4 PCIe Card adds insanely-fast SSD speeds to Mac Pro
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How to Speed up your iMac with a NVMe 960EVO M.2 SSD - YouTube
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Amazon.com: PCIe NVMe Gen3x4 SSD 1TB 512GB 256GB 128GB 3D TLC NAND Flash Hard Drive SSD Replacement for Macbook Air 2013-2017, Macbook Pro Retina 2013-2015, iMac 2013-2017, Mac Pro 2013, Mac Mini 2014 (1TB) : Electronics
Amazon.com: FLEANE FM13A 512GB PCIe NVMe SSD with DIY Tools for MacBook Air A1465 A1466 (Mid 2013-Mid 2017), MacBook Pro Retina A1398 A1502 (Late 2013-Mid 2015), iMac A1418 A1419 (Late 2013-Mid 2017) : Electronics
Upgrading an older iMac's PCIe SSD: Third-party solutions that save you beaucoup bucks | Macworld