After you disable the Optane cache, and before you image the HDD, you need to reconfigure both Windows and BIOS to use AHCI because they're currently set to use RAID. This has to be done the right way, or you'll make the PC unbootable. Confirm everything works properly and then you're ready to image the HDD onto a new M.2 NVME SSD.
Hey guys,  Someone has asked me to upgrade their Inspiron 5680 Desktop because it is very slow. He is running Windows 11 with 8GB of RAM, Nvidia 1060 GPU, i7 7th gen CPU, and the 1 HDD.  My first two recommendations were to upgrade the RAM and the HDD. I noticed he only has 1 stick of 8GB DDR4 RAM. The service manual shows different configurations and so I thought it would be good to bump him up to 16 GB (2x8GB) of 2400 MHz RAM. I found this one on Amazon: Corsair RAM. and through my research this seems to be compatible.  I'm stumped on something else though, he has a 3.5" HDD and then on the motherboard he has an Intel Optane M.2 SSD but in Windows it is only showing the one C drive with 1 TB on it. From what I've read, the Intel Optane beefs up the HDD to act as a SSD. I am wanting to replace the Intel Optane with a M.2 SSD like I have and make that the boot drive, then have the 3.5" as backup storage.  I'm very nervous about compatibility issues and what the best M.2 SSD is to get. According to the service manual, this is what it shows [IMAGE] Would this one be ok? [URL] 
Dell Inspiron 5680 Upgrading Speed (Intel Optane)