Bit locker must be suspended or you will be locked out. AHCI vs Raid  SATA operation F2 BIOS setting must also be changed or you will get inaccessable boot device. The default is RAID OPTANE INTEL RST. Bit locker is storage aka HDD SSD etc. Nothing whatsoever to do with PCI-E cards or Drivers loading. Cloning is not supported by Microsoft or Dell. If you have install/cloning issues you will have to take that up with the software vendor.
I am planning to install a Rosewill Model RC-508 4-Port External USB 3.0 PCI Express Card in my Inspiron 3670.  I recently upgrade the power supply unit to 365W. The Rosewill card has a 4-Pin Molex connector for power if needed. The Rosewill information says that power for the card is supplied from the system power and that should be sufficient. But in case it isn’t, then additional power through the Molex connector is required. My question pertains to using an available on-board SATA HDD power connector. I recognize that I would need a 6-Pin SATA Power to 4-Pin Male Molex cable if this is doable. I also know that I would need to turn-off the Secure Boot prior to installing the card and rebooting. Any comments are appreciated.
Use Of On-Board SATA HDD Power For PCIe Card