Intel Celeron 266

266 MHz
No L2 cache
Single Edge Processor package (slot 1)

Engineering sample
Front view
Image reduced 2x times

Celeron 266 based on Covington core was the first processor from Celeron series. While this processor had poor performance due to lack of L2 cache, it was very popular because with its low price and very high overclockability the CPU had very good price/performance ratio. Many Celerons 266 could be easily overclocked to 400 MHz by changing bus frequency from 66 MHz to 100 MHz. Even if the microprocessor wasn't running stable at 400 MHz, it was still possible to run it at 333 MHz by changing bus frequency to 83 MHz.

AMD K5 PR200 - AMD-K5-PR200ABX

AMD K5 PR200 - AMD-K5-PR200ABX

200 MHz Rating, 133 MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

K5 200 MHz version was not officially announced by AMD, probably because this processor was released at about the same time as K6 processors. This CPU runs internally at 133 MHz and has integer performance on par with Pentium 200 processor.