I have an 850 Evo, that I installed my OS(es) to, and symlinked my user directories (which I store on my larger conventional drive) to.
In other words,
- I deleted my {fresh, empty} Desktop, Documents, Downloads, Music, Pictures, Saved Games, and Videos folder from my %UserProfile% directory, then:
open elevated command prompt (Win+ X + A in Win 10)
mklink /d {Link} {Target}, so,:
mklink /d C:\Users\{username}\Desktop D:\Users\{Username}\Desktop}
(You could store it wherever, like D:\Desktop or D:\blah\spaghetti)
The only caveat is:
1) If the drive letter changes, the links become invalid (but you can still just go to D: and find your files, and you can delete the old links and make new, valid ones, or just swap the drive letter back and all will be well).
2) If you re-install / upgrade Windows, Setup won't see the links as valid (during setup process the drives don't have the same letters, for whatever reason), and so it will make new, blank folders, but since the link file exists, it will call them Desktop (1), Documents (1), etc. Once it restarts into normal Windows, your drive letters will be normal, the links will work again, and you can safely delete the blank (1) folders.
I also keep a Program Files and Program Files (x86) folder on the conventional drive, in case I want to install something large but don't want to use the SSD. I can always just move it to the opposite folder (on the SSD if I need speed, or on the conventional if it's not that much faster or I need space) and mklink /d to the original location
NOTE the {Link} must not exist (there must not be a file or folder with that name in the current directory, as the link is going to be a special file that for all intents and purposes acts like a folder).