@sealovererik :
Thanks for posting the HardwareIDs. They verfify, that the Intel SATA Controller of your Dell Latitude E7470 has been set within the BIOS to RAID mode, whereas the system drive of your Dell XPS 15 9550 is connected to an Intel SATA port as well, but running in AHCI mode.
Both notebooks have a Mobile Intel 100-Series chipset.
You can find the related Intel RST(e) driver versions, which I recommend for your systems, within the table at the bottom of the start post.
If I were you, I would take the Intel RST(e) RAID driver v13.2.8.1002 WHQL for your Mobile Intel 100-Series chipset RAID system (Dell Latitude) and the Intel RST(e) AHCI driver v14.8.12.1059 WHQL for your AHCI system (Dell XPS 15).