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 currently on the market. Fortunately for all of you, we just got our chance: here at Mobile World Congress, the company has reference tablets set up expressly for the purpose of running tests. So, we did just that... over and over and over until we had a long list of scores. Meet us after the break to see how it fared.