Looking for PCIe to SATA 3 Add-in-card

NavyLCDR said:

The easiest way to go from an old BIOS computer to a new UEFI computer would be to make an imagine of the old computer drive. Then do a clean install of Windows 10 to the new computer. Then boot the new computer from the Macrium Rescue flash drive and restore ONLY the C: drive partition from the old computer over the top of the existing C: drive partition on the new computer. Then run the Fix Windows Boot Problems from the restore menu in Macrium.

Wow! Not obvious to me why those steps are required but I can do it.
Can you by chance give me any insight as to why this is the best way? I gather it would not work to just restore the old drive in its entirety to the new UEFI environment?
To restore the C: partition from the old computer over the top of the existing C: partition on the new (clean installed) computer, I would assume care should be taken to assure the old C: partition is smaller or equal in size to the C: partition on the new computer. Would that be correct?
When this is all completed, will the System Reserved and Recovery Partitions function as intended?
In case it helps, I attached a pic showing the construction of my existing physical Win10 SSD. Thanks for your continued help with this.

You actually can just restore the entire image to the new computer, but it can't be in UEFI mode. You would have to boot that computer in CSM mode.

To boot in UEFI mode, the new computer must have a FAT32 EFI System Partition rather than the NTFS system reserved partition the old computer currently has. Doing the clean install first on the new computer will establish that FAT32 EFI System Partition. Transferring over only the C: drive partition from old to new computer's then establishes your existing OS on it. Finally running the Fix Windows Boot Problems utility in Macrium Reflect will ensure that the BCD in the EFI System Partition is actually pointing to the replaced C: drive partition.

NavyLCDR said:

You actually can just restore the entire image to the new computer, but it can't be in UEFI mode. You would have to boot that computer in CSM mode.

To boot in UEFI mode, the new computer must have a FAT32 EFI System Partition rather than the NTFS system reserved partition the old computer currently has. Doing the clean install first on the new computer will establish that FAT32 EFI System Partition. Transferring over only the C: drive partition from old to new computer's then establishes your existing OS on it. Finally running the Fix Windows Boot Problems utility in Macrium Reflect will ensure that the BCD in the EFI System Partition is actually pointing to the replaced C: drive partition.

Thanks for this information NavyLCDR. I will to do a little research to better understand what UEFI mode and CSM mode are but your instructions are clear. I think I'm pretty well armed now with what I need. I just need to find some time to make the right choice of components like chipset, mobo, and processor. I'm not well versed on the latest components since my last build was nearly 10 years ago. Should be fun though!

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Many thanks to all of those who chimed in with comments, suggestions and advice. Much appreciated!!