The single core Athlon 64's and FX's run alot cooler then then Athlon XP's and P4 Prescotts do, so even with dual core, chances are, they still won't be that hot and if they are, they'll be designed to cope with it, there are some very effective are coolers out there by the way, particularly in the realm of Zalman and Thermaltake, and these coolers can keep most CPU's at a safe temperature, not as low as water cooling but still safe, as such, AMD should be able to provide an air cooler that is sufficient. As JKDDragon said, its illogical to release something that will cut out half their market.