VPS Hosting, Shared Web Hosting, Game Servers, Virtual Desktop Server (With 50 or so raspberry pi clients :p ), or a fucking huge NAS. You could run multiple instances of Minecraft, DayZ, Quake 3, BF3, or BF4 server. These could be run in a virtualized environment (I recommend Xen Server), or each in their own Linux jail. IF you wanted to make a some cash you could rent out any of the above as services. Alternatively you could hoard all of that cpu power to yourself and find a crypto currency that is efficient to mine with raw cpu power.