I've been running BOINC, and since none of the tasks required GPU, as you mentioned, I was able to scale to a number of devices that the client could be compile

I've been running BOINC, and since none of the tasks required GPU, as you mentioned, I was able to scale to a number of devices that the client could be compiled on. If you have 5-8 hours to devote to a round, put everything you have into it. It's quick to set up and is certainly worth the cycles.