Anyway, most games have a design that allow them to load everything they will need at a given time (loading, transitions, etc) and then never hit the hard drive again, as long as the memory is large enough to hold everything. For those games, a SSD drive doesn't give more fps if you do have enough memory (and if you can afford a SSD, you can afford RAM), only shorter loading times or faster alt+tab (since the game memory can be moved to the hard drive while you're on your browser).
The exceptions are typically games with a continuous world (elder scrolls, mmorpg, etc).