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The 'Cel' of Celeron rhymes with 'tel' of Intel." Covington also shared the 80523 product code of Deschutes.Although clocked at 266 or 300 MHz (frequencies 33 or 66 MHz higher than the desktop version of the Pentium w/MMX), the cacheless Celerons had trouble outcompeting the parts they were designed to replace.This method of cache placement was expensive and imposed practical cache-size limits, but allowed the Pentium II to be clocked higher and avoided front side bus RAM/L2 cache contention typical with motherboard-placed L2 cache configurations.Over time, newer Mendocino processors were released at 333, 366, 400, 433, 466, 500, and 533 MHz.Indeed, most industry analysts regarded the first Mendocino-based Celerons as too successful—performance was sufficiently high to not only compete strongly with rival parts, but also to attract buyers away from Intel's high-profit flagship, the Pentium II.

This has been the primary justification for the higher cost of other Intel CPU brands versus the Celeron range.

Some motherboards were designed to prevent this modification, by restricting the Celeron's front side bus to 66 MHz.

However, overclockers soon found that putting tape over pin B21 of the Celeron's interface slot circumvented this, allowing a 100 MHz bus.

The initial market interest faded rapidly in the face of its poor performance and with sales at a very low level, Intel felt obliged to develop a substantially faster replacement as soon as possible.

Nevertheless, the first Celerons were quite popular among some overclockers, for their flexible overclockability and reasonable price.

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