I used Macrium Reflect to clone the HDDs to SSDs on a Dell Optiplex 9020, 790, and 390. It only worked on the 9020 and not the other two. All 3 of the clones took about half an hour, and all of the partitions were the same size. Just on the Dell Optiplex 390 and 790 they won't boot. They both just say "No bootable devices". All three are in UEFI mode and the SSDs are plugged into the same SATA ports as the HDDs were.