Every nerd loves a good tech war: Windows vs Mac, Apple vs Android, Intel vs AMD. They give us something to armchair argue about over beers with friends -- or to rant over in the comments of illustrious tech blogs. After spending the weekend playing with AMD's new Vega 64 and Vega 56 graphics cards, I think I can safely say an old tech war is back on -- even if AMD's latest salvo feels paltry. Nvidia might be leading the discrete graphics card industry, but AMD's two newest cards are cheap and fast enough to finally compete. And that can only mean good things for PC users.