We were half expecting AMD's next graphics card to be some sort of supercomputing colossus, given all the buzz around NVIDIA's GTX Titan. As it turns out, though, we're looking at something more subtle and just slightly more affordable: the new Radeon HD 7790. It slots into a cosy niche between the 7770 and the 7850, targeting gamers who want a good helping of 28nm silicon and potential fo
