Heyyo,
There's no point really for Intel to hit that 4GHz limit. AMD could easily beat them out with the already impressive FX-57. Heck, the FX-57 isin't even near 4GHz. So AMD could uber-slaughter Intel on single core. They knew this, so inna smart move they focused on dual core. I wasn't so much about fan respect, it was about wroking on getting out the best cpu they can, and their isin't any big improvements left on single core anymore anyways people.
So I say intel did a smart move. Plus, have you guys seen the pricetag on the FX-57? now think of the P4 at 4GHz. yeah. I'd probably be cheaper to get the new mobo that supports dual core and a dual core cpu than get the FX-57 or the P4 GHz (if it existed).