Maximum PC: Nvidia's firing on all cylinders today. The GPU maker made waves early this morning by formally introducing the world to its GeForce GTX Titan graphics card, which is supposed to offer comparable performance to the dual-GPU GeForce GTX 690 part for the same price, and now Nvidia is announcing its first fully integrated 4G LTE mobile processor, the Tegra 4i (codenamed Project Grey). (Hi-tech, NVIDIA, Nvidia Tegra 4i, Phones)