AMD Mobile Athlon 4 950
Technically the Palomino core (used in this CPU) is the fourth iteration of AMD Athlon CPU's. It has been optimized and uses 20% less power (and thus 20% less heat).
The Mobile Athlon 4 is the first series to use the, then new, Palomino core. Some sources indicate it was called Corvette rather than Palomino.