> It's still a limited use in the sense they're not being used to render 3D > geometry..you know, the thing they were primarily invented for.
Welcome to 2013, where Nvidia sells more GPUs for general-purpose computing than for graphics (we're talking cards with no video outputs), and AMD is trying to catch up. The last 2 generations of NV GPUs were designed for compute first and gaming second (and AMD's next-gen chips will be as well), so in fact everything you do on your PC is currently not "the thing they were primarily invented for".