I increased the FSB from 100.2 to 105, and the BIOS POSTed OK, reporting that the CPU was 266 speed. But when the Win98 desktop appeared, it displayed an unusual message saying something about the registry having errors. Unfortunately, I think 105 FSB is just a bit too high.

The following webpage shows some user results for overclocking P MMX 166s -

http://web.singnet.com.sg/~duane/b7000001.htm (near the bottom)

Someone has overclocked a P MMX 166 SL27K to 290mhz at 3.2V. I think that's very risky. If you check out the cpu-world webpage for the SL27K CPU -

http://www.cpu-world.com/sspec/SL/SL27K.html

The core voltage values are from 2.7 to 2.9

Hey I had one of those Iwill XA100 boards back in the day, initially had my P166 mmx in it o/c'ed to 250 (ty 100 mhz bus) and later put a K6-2 400 in it for the kids. My main issue with it was that the voltage selection sucked. Never could overclock that K6 at all, kinda disappointing.

By the time the K6-3 came out it was too late, most everyone had already jumped on the PII bandwagon which were most easily upgraded to the PIII. I owned a Abit BX6 r2 back in the day that seemed to last for years, first a celeron 300A@450 then a Celeron 533A@800.

retro games 100 wrote:

This webpage looks interesting:
http://www.hattix.co.uk/hardware/index.php?page=cpu.html
It talks about P MMX CPUs, locked and unlocked multipliers, AMD K6s, and lots more.

Ah, you found it too! it's a good read. Though sometimes a bit biased. (For example the Pentium III is not given much coverage or credit. Neither can I agree on the usual shortsighted AWE64 praise there.)