paintballer4lfe wrote:Yeah that's the weird part about this z420, it is literally in the SAT3 plug.
I go into the BIOS the storage device config list Hard Disk under SATA3 and the CD/DVD drive is listed under SATA2.
Under Storage Options the removable media boot is set to enable and the SATA Mode is set to RAID+AHCI.
I am stumped as to why i am getting such slow speeds, i did try other bechmark tools and they all listed the same speeds.
My BIOS Version is 3.91 if that makes a difference.
I am also on 3.91 bios, and before upgrading to the Samsung 950 Pro NVMe drive I had a 850 EVO Sata drive - this was performing at full speed. It is not a driver issue, since the Sata drives just use the standard Windows 10 drivers.
I would go for a full clean install of Win 10 in UEFI mode and see if that clears up the AHCI issue. The other thing you can check is the Sata cable - a bit of a long shot, but maybe try changing it for a new one where it explicitly states it supports SATA3?