As a matter of fact you can use SSD for readyboost. If you have a cheap one lying around you can configure it as one and get some amount of performance boost by moving your page file there and any data files you may be working on currently (say source code, if you are a developer or video).
But really, readyBoost is a relic from the days when RAM was still a precious commodity. These days, memory is dirtcheap, just use the ssd as system drive and upgrade your ram to max. I noted you have 4gb ram only, though you are using the 16gb cards also.