There are poor M.2s. However it's not SATA vs NVME which is to small a difference to measure in most cases. SATA SSDs can easily hit 1.5GB (b as in byte) per

There are poor M.2s. However it's not SATA vs NVME which is to small a difference to measure in most cases. SATA SSDs can easily hit 1.5GB (b as in byte) per sec. NVMEs have a small advantage at higher queue depths I believe (not typical of desktop workloads). But all the benchmarks I've seen put the difference so small that it's hard to tell if it's real or just sampling error.