AMD K5 microprocessor family

75 MHz
296-pin ceramic staggered PGA

75 MHz
296-pin ceramic staggered PGA

90 MHz
296-pin ceramic staggered PGA

90 MHz
296-pin ceramic staggered PGA

100 MHz
296-pin ceramic staggered PGA

100 MHz
296-pin ceramic staggered PGA

120 MHz Rating, 90 MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

This is the first K5 processor that internally ran at slower speed than its rated speed. With 90 MHz internal speed, this processor slightly outperformed Pentium 120 in integer applications. Unfortunately, floating point performance of PR120 was significantly slower than the Pentium 120.

133 MHz Rating, 100 MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

133 MHz Rating, 100 MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

Comparing AMD K5 family with Pentium CPU family you may notice that all AMD K5 microprocessors rated 120 MHz or higher were manufactured with integrated heatspreaders, while the fastest production Pentium microprocessor with integrated heatspreader was Pentium 100. The cause of this is much higher typical power dissipation of AMD K5 microprocessors. For instance, this K5 133 under normal conditions dissipates more than 10 Watt - this is twice as much as typical power dissipation of Pentium 150 microprocessor. Adding copper-based integrated heatspreader to the package helps to spread the heat faster as the copper better conducts the heat then the ceramic.

150 MHz Rating, 116.7(?) MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

This 150 MHz CPU runs at the same bus speed and has the same clock multiplier as K5 133 MHz. Nevertheless, in some tests the processor performs a few percent faster than the K5 133 MHz CPU. This increase in performance was due to changes in the processor core.

150 MHz version of AMD K5 was probably released at the same time as 166 MHz version, but it's difficult to tell for sure because this version was never announced by AMD.

166 MHz Rating, 116.7 MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

Engineering sample

166 MHz Rating, 116.7 MHz Real
296-pin ceramic staggered PGA with gold-plated heatspreader

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.