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I've tried a 59.9MHz and 60MHz oscillator, and the machine ran for a few minutes, but failed, when it heated up. The speedup was NOT proportional to the clock frequency; the machine was only as fast as with 50MHz. There seems to be a point, where a higher clock frequency results in a slower CPU speed (perhaps, because a second wait state has to be inserted). With a 68030, this point is between 48MHz and 50MHz. I wasn't able to try a 55MHz oscillator, because the loaned one was defective.
Hey guy's! Clean the airflow from dust and replace the old fan by a new (better) one! The machine will die horribly, if you don't take precautions against overheating!!!
How you easily can see most of the system-clocks are generated by U110 and so replacing this one gives your system a nice speedup (and warmup).Peter Koch include "/var/www/vhosts/sun3arc.org/htdocs/include/footer.phtml" ?>