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Old 07-15-2019, 12:33 AM
Darryl Ramm Darryl Ramm is online now
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Join Date: Nov 2010
Location: USA
Posts: 13,214
Default Re: NVMe upgrade for Mac Pro 4.1/5.1 Mojave

Your Mac Pro has a PCIe 2 not PCIe 3 slots and the NVMe m.2 card you have is PCIe 3. You are running it at half speed. You need to look for a switch based PCIe 2 x 8 adapter card that switches down to PCIe 3 x 4.
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