X86-Secret : ES Zone
Athlon 600 MHz ES  (Week 22, Year 1999)   
AMD-K7 ENGINEERING SAMPLE - K7 C1 600 MHz CGA - Pit 007 DET N512K T3

One of the first engineering sample of the AMD K7, known under the commercial name of "Athlon", in the first packaging AMD choose fro sample (big AMD logo on the front) . This CPU used the 0.25 ┬Ám core and comes with 512 KB of L2 cache (external). This engineering sample use a clock speed of 600 MHz (6.0*100) and the first Athlon was launched with clock speed of 500, 550 and 600 MHZ on Jun, 23th 1999. This CPU was built in the may 1999.