@Nishi Here are the ones I have!
I also have an extremely rare K6-3+ 500 MHz somewhere, but I can't find it now. And everyone's favourite of the time — Celeron 300 MHz, which could be easily overclocked to 500 MHz.
@nicemicro I have more pleasant memories about these 😅
K6-2 was the CPU that made me learn that compiler optimizations make a difference. On K6-2 for example "mov AX, 0" was faster than "xor AX, AX" — that is what most used to zero out the register, so just rebuilding with -march=k6-2 was giving you sizeable performance gains. In QuakeForge on heavy scenes it was 22 FPS vs 17 FPS — nothing to sneer at! In integer maths the improvement was 20-25% on average, then there was 3D Now!
@Nishi