i've just upgraded my AMD k6 300 (4.5x66) to an AMD k6-3 400 (4x100) .
i checked the mobo specs and updated its bios.
the system has been very unstable eversince. i get frequent error messages (this application has created errors), and RunDll errors and then a crash, resulting in windows having to restore a backup of the registry.
this, it cannot do and goes into a cycle of backingup and restoring the registry.
i've tried different memory, different memory clock speeds, setting CPU voltage + autosetting it. i'm now trying running at 5.5x66 = 366.
i've also got the following error message when installing windows :
"Rundll32 caused an invalid page fault in module Kernel32.dll at 0167:bff9db61
Hey man i used to have the k6-2 cpu's and i always used a Red Fox board. They might not be the best board out there but they are stable and reliable, i never had any problems with that board. But my guess would be something in Bios is wrong maybe? id try unplugging all your cards (sound, nics, modem ect...) except for video and see what happens.
Is it an old K6-3 or the newer K6-3+. I have the original K6-3 400 and it is picky. What voltage you using? I have to run it at 2.4V or it will blue screen like crazy. I also can't OC it at all. Try increasing the Voltage a tad.
What board did you have (you need a superTX (ALi IV or ALi V or SiS530 or VIA 5591 support 100 MHz bus - the Super7 spec) equivalent chipset, intel doesnt have any of those)?
check you RAM, does it support 100 MHz?
Just to make sure, run your new CPU with old frequency settings and see whether the same thing occurs. If it doesnt then something (your mobo or RAM or some older component) does not support 100 MHz.
Better upgrade you motherboard to Asus P5A or P5A-B, the best super7 boards I've seen. or even the RedFox board is okay, I have used it. and also make sure RAM is PC100.