PCIe 4.0 vs 5.0 SSDs: does doubling bandwidth actually make your PC faster?

How this is calculated

Sequential read speeds above 5 GB/s are only fully utilized by a handful of workloads: 8K video editing with uncompressed RAW footage, large dataset transfers between two PCIe 5.0 SSDs in the same machine, and AI training pipelines that stream massive datasets from local storage. For gaming, application launching, and general use, random 4K read performance is the bottleneck, and PCIe 5.0 drives are only marginally better than PCIe 4.0 drives at random reads (both are limited by NAND latency, not the interface). PCIe 5.0 SSDs also run hotter and often require active cooling. For most users in 2026, a good PCIe 4.0 drive is still the sweet spot.

Verdict

Doubling per-lane bandwidth takes x4 NVMe from about 7 GB/s to roughly 14 GB/s on Phison E26 and PM9E1 drives, but few workloads notice. The ones that do are 8K RAW video editing, local SSD-to-SSD dataset transfers, and AI training pipelines that stream from local storage. Gaming and app launch run on random 4K reads, which both PCIe generations cap at similar rates because NAND latency, not the link, sets the ceiling. PCIe 5.0 also runs hotter and usually needs active cooling.