RE: Dell M.2 FAQ regarding AHCI vs RAID ON, Storage Drivers, M.2 Lanes, Performance and more
There are already some benchmarks for Dell 7577 systems online on userbenchmark.
Toshiba KXG50ZNV256G (results from 330 7577):
In comparison to Dell 7577 with Samsung PM961 systems (without any Seq Writes under 1000 MB/s)
In my opinion this seems to be a driver issue. About one year ago there had been already problems with the Toshiba XG4. Some people used the OCZ RD400 driver to increase the Seq Write.