Exactly. Marketing. Well, I don't know about the 'illegal and unethical' part -- many business strategies can be seen as unethical or in grey areas. Considering the market share that Intel has, I really don't think they're scared, at all. A competitor is a competitor, you do what you think is best to make sure they don't cause you to lose money. The day when corporations act completely upright and ethical is the day hell freezes over As for the effectiveness of hyperthreading, it did work, it just did not provide the kind of performance boost seen in current hyperthreading enabled cpus. Yes, not many applications took advantage of it, but it performed its purpose. Marketing. The method was improved, announced, more developers came on-board, etc., performance boost. Marketing. Could have been done years sooner, if Intel so chose. It wasn't necessary, AMD didn't catch up to Conroe.