I am getting a new PC today that should greatly improve my Sonar experience. This new computer is going to boot from a sold state drive, which is nice, but turns out I also own my own SSD which I can install as well. My question is: What would be the most beneficial thing to put on this non-boot SSD? And the nominees are:
* Sonar application itself
* My Sonar project folder/files
* EastWest application (Orchestra Gold)
* EastWest sample library (Orchestra Gold)
* Something else

The only clear advantage to an SSD is if you are streaming large sample libraries directly from the drive. Check with the East-West documentation to see if that applies to your library. Buffers and pre-loading options can affect actual performance, and you may not notice any improvement depending on how you work. A 7200 rpm mechanical drive will typically handle the Sonar audio files, and programs typically run from memory once they load on first call, so they will not benefit as much as most people think.

I have SSD 's only (4) in my studio pc, and it is working like a charm. It is the greatest increase in performance I have seen on my pc setup.
All the best.

For your system drive using the SSD drive, yes, boot time is very quick, and opening programs is faster, that's all.
 
To utilize your other SSD drive, it would be most beneficial to have it as a drive containing your sample libraries, rather than merely hosting Sonar projects. Samples will load faster. How large is your extra SSD drive ? If you have really large sample libraries there's always the argument about whether having a decent 7200 rpm sample drive vs. a large SSD drive for samples will get any performance increase, because the large SSD drive costs so much more.
 
Once the samples are loaded into RAM, is there any increase in performance ? . . . probably not. The question is, do you have time to wait a few minutes for large sample libraries to load from a 7200 rpm drive ?

I am converting my System drive to SSD for performance but also to try to reduce ambient noise in my studio.  

jcunn51
I am converting my System drive to SSD for performance but also to try to reduce ambient noise in my studio.  

You will be happy with that.
All the best.