Mainframes are not POWER, they are z/Architecture. For AS/400 (IBM i), they're POWER, but come in pretty small models like IBM Power S1012, it's available as "

Mainframes are not POWER, they are z/Architecture. For AS/400 (IBM i), they're POWER, but come in pretty small models like IBM Power S1012, it's available as "deskside", i.e. a big tower.