It’s not Tegra 3, it’s 4-Plus-1
NVIDIA wants to make sure that consumers get the full skinny on their new Tegra 3 chip’s architecture. Sometime last year we did an article sharing that the Tegra 3 is actually a 5 core chip, rather than just a quad-core chip. It has 4 primary cores for running intensive calculations, but also has a 5th "shadow-core" (which has also been called the "ninja-core" by NVIDIA). This 5th core is designed to handle easy to calculate and mundane tasks to free up battery life and improve over-all efficiency. Previously, their in-house name for this architecture was "Variable Symmetrical Multiprocessing", but that is rather a mouth-full to share as marketing speak. So, to make things easier, they came up with the simple alias, 4-PLUS-1.
You can see below the quote from NVIDIA’s press post:
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