There is no such thing as the "Atmel Arduino" You're talking about AVR8, which is the ATMega328p and its children and siblings. There exists, though less popul

There is no such thing as the "Atmel Arduino" You're talking about AVR8, which is the ATMega328p and its children and siblings. There exists, though less popular, a complete rebuild of the AVR architecture in 32-bits called AVR32. The instruction set is different, the peripheral IO is different, but the design is similar. The AVR32 was powerful enough for quite some time to run a full fat Linux, though this was dropped for a handful of reasons.