You have a secondary system or a laptop that's still running a platter? So your brother didn't want it - what about parents, significant other, friends, etc?
You don't have to be a gamer to benefit from an SSD.
You could just throw it in there for extra storage. Maybe put your Steam folder on it or something. (Assuming it's big enough.)
Scientific progress goes "Boink?"
Windows Gaming Box: AsRock Z77E-ITX / i5-3570k @ 4GHz / 8GB RAM / GTX 660Ti / Samsung EVO 250GB / Seagate Momentus 750GB / Silverstone SG05.
NAS: Foxconn D-70S-P (Celeron 1037U) / 4GB DDR3 / 4x Toshiba DT01ACA200, 1x DT01ACA300, 1x DT01ABA200, / Fractal Node 804.