Fr3der1c :
otherwise, what's the best option for a gaming rig ?
SSD #1 - OS and all applications
SSD #2 - whatever games fit
HDD - all that other junk. Music, movies, video, etc, etc.
Using SSD #2 as a cache for the HDD wastes a lot of the benefit of having that SSD speed.
Is it possible? Yes. Is it the best way to use those resources? Not IMHO, no.