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Home Forums 68kMLA Crescendo G3 NuBus and whacky system bus speeds? — #1
Post #1 by Trash80toHP_Mini
Source Forum68kMLA
CategoryPowerPC
Post DateSat, 26 Oct 2013 - 05:55
Original URLhttps://68kmla.org/bb/threads/crescendo-g3-nubus-and-whacky-system-bus-speeds.29156/
Post
Looking through LEM, I noticed something curious. The low end Radius System 100 has a slower proc @ 80MHz on a 40MHz bus. The faster 110MHz processor sits on a slower 37MHz bus. Mine is the Radius 81/110, which came only in the 110MHz flavor with the slower 37MHz bus.

http://lowendmac.com/radius/100.html

http://lowendmac.com/radius/110.html

Question: Since I'm running a G3 Accelerator and the Proc is idling, if it's running at all, should I overclock the System Bus? 40MHz ought to be a nice kick in the pants for overall performance. [:D] ]'>

Maybe I can push it even harder! [}:)] ]'>

The max oscillator you can use in the 8100/110 is 45 MHz, to run the processor at 135 MHz.
http://lowendmac.com/chip/x100.html

http://lowendmac.com/ppc/power-macintosh-8100.html

Since the processor is likely the limiting factor in overclocking the 8100, might it go even higher? AFAIK the G3 Accelerators are asynchronous, so pushing the MoBo higher than 45MHz while the 601 sleeps might test out fine.

Did I mention I've got a backup 81/110 MoBo. ;D

mp.ls