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BARCELONA, Spain--Nvidia showed off its hot new Tegra 4 and Tegra 4i mobile processors here at Mobile World Congress, where we went hands-on with some of its reference devices. The glossy graphics of Real Boxing were rendered well with smooth frame rates. It'll certainly keep the casual gamer happy, if nothing else.

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This power meter showed the Tegra 4 processor was using around 900 milliwatts of power during high-definition video playback -- around 25 percent less than most smartphones would achieve.

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Zombie Driver has been optimized for the Tegra 4 processor. Even on this 1080p display, the gameplay and dynamic, real-time shadows were extremely smooth.

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If you take gaming seriously, you'll want to hook up an external controller.

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In general use, Nvidia's reference tablets were pleasingly swift.

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We booted up various benchmarking tools, including Geekbench 2, where we saw a score of 4,066 -- around three times what the Google Nexus 7 achieved.

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It handled 3D graphics tests extremely well, too.

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There aren't any finished products using the Tegra 4 chips just yet -- here are some reference tablets.

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The Tegra 4i is smaller than the previous generation and has a built-in LTE modem.

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Power consumption seemed generally impressive, but we'll have to see what real-world battery tests are like when we get devices in our hands later in the year.

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