When NVIDIA unveiled Tegra 4 back at CES, we scrambled to get hands-on with a reference device. And though our initial performance impressions were positive -- it runs 1080p video and games smoothly -- there was only so much we could say to illustrate how fast the performance is. After all, Tegra 3 already does a fine job handling games and full HD movies. What we really needed were benchmarks, some quantitative data to help show the difference between Tegra 4 devices and whatever's c
