Tegra is ARM based, and with the low end part using 300%-400% more than the tegra 2 they are clearly for different devices. Atom is more or less the comparable

Tegra is ARM based, and with the low end part using 300%-400% more than the tegra 2 they are clearly for different devices. Atom is more or less the comparable part. If you're wanting to compare to an atom based SOC that's Sodaville or the CE4100 which is the chip they switched to for the boxee box.