Does NVMe use PCIe lanes?
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No, the a PCIe/NVME SSD uses the x4 provided via the chipset. The H100 series, Z170 and B150 had an extra 4 PCIe lanes (for max 20 when added to the CPU). The 200 series is max 24, so brings an extra 8 to the table. You can use 2x M.2 NVME SSDs (both x4) and still have the full x16 available to your GPU.