We can be brief about the performance of the Tegra 4. It's a very powerful chip, and it stands head and shoulders above all of the other SoCs used in Android tablets. The Tegra 4 has a GPU that's actually as powerful as the one in the iPad, which is definitely an accomplishment.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips