Advanced Micro Devices Inc (AMD)

[aixman]

There were no technical or thermal limitations that prevented Intel from releasing a 4-GHz product, Kirby says. But there were practical limitations, so that to release such a product Intel would have to devote time and energy to tweaking circuit designs and testing those chips, he says. That always takes place when a chip maker validates a higher speed grade, but at a certain point it's no longer worth the effort, he says.

These seem to sound an awful lot like "technical" limitations to me!