A rather debatable topic I found at Yahoo.
Intel Corp. is "devaluing the meaning of megahertz" with its Pentium 4 design, charges rival chip maker Advanced Micro Devices Inc., which claims the chip's design makes Intel's frequency claims misleading.

Just over a year ago, AMD proudly proclaimed its success in beating Intel to the 1GHz level with its Athlon chip. But now, following Intel's release of a 2GHz Pentium 4, the smaller chip maker is crying foul.
AMD representatives this week sought out reporters attending the Intel Developers Forum in San Jose, Calif., to raise awareness of the issue.
"Over the last 20 years, AMD and Intel had similar architectures … so the fundamental difference between AMD's and Intel's products were the frequencies," said Aaron Seen, a spokesman for AMD, based in Sunnyvale, Calif. "Recently, with the advent of the Athlon and Pentium 4 processors, we've fundamentally diverged in terms of our architectures."
Specifically, Seen alleges, AMD's Athlon does more work per clock cycle than the Pentium 4. As such, an Athlon could essentially handle processing applications faster than a similarly clocked Pentium 4.

"We need to help educate the end users about the difference between frequency and performance," Seen said.