"But, they aren't. " You think they aren't when they go calling on major accounts? "The $100 premium is most likely the Centrino branding and power." Maybe. But the Turion version is the one in the ads. "The $300 premium is b/c there's higher performance in Core Duo" Except that is a Core Solo at 1.66GHz. I doubt if there is any performance advantage. The Core Duo will cost you even more.