I'm not 100% certain, but I have a vague idea that the problem could relate to the Via VPX chipset. The fact that a K6-2 233MHz was giving you aggro goes some way to confirming my hunch, wich is either a lack of voltage support or a need to run the K6-2 in a certain configuration.http://www.aberdeeninc.com/abcatg/mb5804.htm
' ">http://www.anandtech.com/showdoc.html?i=155&p=17Possible Cause
This is an old chipset, and you could be asking too much running at this speed. Aim for 233MHz to begin with so that you aren't pushing the voltage regulators too hard. Also double-check the core voltage & CPU type (P55c, 2.2v core).
2)This is a hunch..
Are you running the FSB in Asynchronous mode, i.e
= 33MHz PCI
Or in Synchronous mode, i.e
= 37.5MHz PCI
Some chipsets like the TX Pro (PC Chips M571), won't run the K6-2 in asynchronous mode, unlike the Cyrix chips which don't mind running in either asynchronous or synchronous mode. It may be a similar problem here.
Set the FSB to 66MHz (x3.5)
and the dividor to 1/2 to give a PCI bus speed of 33MHz. Then if it's stable go to 75MHz, but do not use 83MHz because this can damage any components connected to your PCI bus, including your IDE devices because the PCI speed would be 41.5MHz. It's OK to run Cyrix chips at 83MHz in asynchronous mode because the dividor guarantees that the PCI bus is kept in check, 33MHz but this FSB is not 'officially' supported by this board.
So here's what I would try in addition to what our friends have suggested:
1) Power down completely & make sure your CPU & memory are firmly seated.
2) Check your CPU core voltage & CPU type: 2.2v core, P55c.
3) Set the FSB to 66MHz & the multiplier to 3.5x to give 233MHz.
4) Check the dividor ratio: set to 1/2 & not 2/5 for the K6-2 (maybe).
5) Check DIMM voltages: 3.3v (OT Never mix EDO/FPM & SDRAM DIMMS).
6) If stable, raise the FSB to 75MHz. This will ensure that your PCI components can take 37.5MHz (most can, always best to check), and will also take the core speed to 262MHz, ensuring that the voltage regulators can take the load.
7) If stable, keep increasing the multiplier bearing in mind the limitations of your board. 6 x 75MHz to give 450MHz is really the top end and it will be asking a lot of the CPU voltage regulators which were only really designed for slower processors.
. AMD CPU Data: http://www.tomshardware.com/20.../amd...ult/page23.html
. Belarc Advisor: http://www.belarc.com/free_download.html
. GPU Comparison for Laptops: <a href="http://www.notebookche