Intel released four new chips this week that are the last of the single core cpu for Intel. The new chips have double the secondary cache, 2MB. Starting this summer Intel will go with a dual core chip that runs slower, but with the added processing power will be improving the overall speed and performance. From a CNET article:

The four chips included in the new 600 series of Pentium 4s range in speeds from 3GHz to 3.6GHz, and all of them feature an 800MHz bus. The top-of-the-line 660 Pentium 4 sells for $605 in quantities of 1,000, while the 630 sells for $224.  The Santa Clara, Calif.-based chipmaker also unveiled another member of the Pentium 4 Extreme Edition processor family, which runs at 3.73GHz and contains a 1.066GHz bus. These chips are used inside computers for gamers and serious hobbyists