Althought I don't think this is likely, as I have seen reports of P4s running at 3.8GHz, but I do beleive the article claim about Windows XP. As this OS unlike 2000 on same hardware refuses to install unless I remove virtually every card from my system. Anyway heres the post Sources That Reckon To Know, claim Intel's 2.80GHz Pentium 4 part may not see the light of day because Windows doesn't like it. Reports claimed that the speed of the chip causes Windows 2000 "to crash and burn." While Windows XP doesn't like the speed of the processor, not one little bit. And it's not just Intel chips too, the claim continues. Athlon processors at high speeds are experiencing problems as well. Press read more for continued coverage This, however, would seem to be extremely unlikely to us because its future depends on scaling the Pentium 4 to 2.8GHz and higher. AMD has similar ambitious plans. Intel was said to be keen to ship the 2.8GHz part early to help build some interest in the flagging market, but those plans may now have lumbered into an unseasonal iceberg. News Source: The Inquirer
Further Info: Processors getting too fast for OSes?