> Though it's not really clear to me why this actually results in an efficiency win over maxing out a single core. i heard the whole multiple core thing is spu

> Though it's not really clear to me why this actually results in an efficiency win over maxing out a single core. i heard the whole multiple core thing is spurred in part by manufacturers trying to increase fab yield: if one of the cores on a multi-core chip is bad, it can still be sold, albeit at a lower price, rather than thrown out.