pastrychef
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@Jamesbond007
After my original post/question, I found another thread on NVMe PCIe compatibility on MacRumors. Of the recommended X4 cards, they mention that X4 will limit speed to 1500 MB/s. Can I assume this limitation is the same with the Silverstone ECM20? Therefore, I may be bottlenecking the 970 EVO NVMe M.2 with this card?
Your Z270 motherboard will not have this limitation. The old Mac Pros are a decade old and only have PCI-e 2.0 which has half the bandwidth of PCI-e 3.0.