Actually they trace their lineage directly to the PIII. The original Atom was based on the Stealey line, which in turn was based on Pentium M, which in turn was

Actually they trace their lineage directly to the PIII. The original Atom was based on the Stealey line, which in turn was based on Pentium M, which in turn was based on the PIII design. Later Atom revisions left that legacy behind and became their own distinct process.