Gentlemen,
I support as number of machines, all with Win98 and above. They run from a Cyrix200, AMD200, Celeron, PentiumII-500, etc etc. The motherboards are of various brands. Not one of these machines has a problem with power saving.
Granted, on rare occasions there is a hardware conflict, however, most problems occur due to some garbage downloaded that is incompatible in the API calls, or TSR corruption. Most are fixed when the HDD is re-formatted, and a clean installation of the operating software is reloaded. This gives a nice clean registry.
As you are all probably aware anyway, Win95/98 generally needs a complete fresh re-load every 12 months or so, depending on what you use the machine for (sometimes sooner). Remember that anything that goes into the registry, stays there. It is only disabled on uninstallation. A clean install gets rid of any conflicitng rubbish in the registry.
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When all else fails, read the manual!