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.