I swapped out the HDD for my 500GB 2.5″ Samsung 850 EVO SATA SSD. Windows 10 and all my Linux partitions booted up fine with no changes or config needed (though this could be non optimal, dunno if I should reinstall for proper drivers config, but I don’t use Windows much at all so don’t care). Manjaro 18 boots up in around 6-7 seconds from this drive. I also currently have LinuxMint Mate installed completely on the Optane drive (just for testing right now). This boots up equally as fast.
Btw, I’m using the rEFInd Boot Manager to control multi-booting everything. But I think Grub would also work fine for a simple Windows/Linux dual boot config.