That goes up to 8GB/s (bidirectional) for PCIe Gen 4X4 SSDs. A single PCIe 3.0 lane can offer 1GB/s (bidirectional) of throughput, so a PCIe 3x4 SSD can reach a throughput of up to 4GB/s read/write. To put it into perspective, the performance limit of the SATA III bus is 6Gb/s, meaning a SATA SSD can offer a max of 550MB/s of throughput after overhead. With the elimination of the intermediating SATA HBA layer, NVMe allows SSDs to communicate directly with the CPU via the PCIe bus, opening channels for ground-breaking performance improvements. NVMe is a storage protocol designed specifically with SSDs in mind.
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