blacktop89 has it dead on: the antiquated NortwoodB (533) processors were officially "left out in the cold" by Intel in favor of the new Canterwood/Springdale based, 800Mhz processors. The actual clock speed of the 533's is 133Mhz while the actual clock speed of the 800's is 200Mhz -- a big difference.
As for processors, the price jump from 2.8Ghz to 3.0Ghz is not worth the performance jump: you're probably better off with the P4C-2.8 and if you desire the extra performance, getting some fancy cooling and then overclocking it
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