Knock down? If AMD does deliver enough 45nm quad-cores this year - enough means probably covering all the press, OEMs, channel demo systems and select key customers and gaming sites, plus a few thousand actually sold - they'd be seen as making a sort of minor comeback. However, the performance gulf would still be kept wide "advantage Intel" by the new Nehalems at decent prices, not to mention current Penryns for even less dosh.