HP 577921-001 - System board (motherboard) - Includes Intel Atom N280 processor, 1.66GHz (533MHz front side bus, 512KB Level-2 cache) - Includes th Retail
HP 601980-001 - System board (motherboard) - With Intel Atom N450 (1.66GHz, 667MHz FSB, 512KB Level-2 cache) processor - No WWAN/SIMM card Retail