Just an update for anyone who actually reads these posts. I had previously reported running my WSI 250MHz at 292MHz and having it overheat. I startedrunning OS 9 to see if it helped the situation any. The machine appeared to work ok, but would also freeze in 9 when it was sitting on my lap. I checked out the Energy Saver control panel and found 'allow processor cycling'. I enabled that an all my stability problems went away. The machine worked perfectly at 292MHz. When sitting running, the machine would go down to ~65 Celsius. During CPU intensive use, it would rise to 86 Celsius or more. But I didn't want to stop at that.
I currently believe the fan in my machine is malfunctioning. It never comes on unless you're resetting the unit with the 4 key combination. The hottest the reported CPU temperature was 96 degrees Celsius. And at that point, the fan absolutely should have come on. After using the laptop for a while, I wanted to experiment more with changing the FSB and multiplier. In my previous attempts, when using a 66MHz FSB I could not get the multiplier to go above 3.5 (83*3.5=292MHz or 66x3.5=233MHz). Thinking that maybe I had missed something, I wanted to try again. I moved the FSB speed back down to 66MHz and started at a multiplier of 3x. I successfully got the machine to run at 200, 233, 266, 300 and 333MHz. Unfortunately, at 333 it took about 5 minutes before the heatsink was saturated and could not dissipate the heat fast enough which caused the CPU to lock up. So, right now I'm running in OS 9 with the cpu set to 300MHz with a multiplier of 4.5. Watching Gauge PRO, it's reporting the cpu temperature as stable at 82 Celsius. It is currently sitting atop my lap while I'm wearing jeans. So, since I have 10.3.6 running on this laptop, and I wanted the faster cpu so I could enjoy my OS X expeience a little more, I had to try it. To aleviate any heat buildup by my using the laptop on my lap, I had shut then machine off for an hour, then set it on the coffee table and fired it up. It booted into OS X without incident. I did notice that the bottom didn't get as warm as when I was running it at 292MHz, which caused the machine to overheat. So, everything appeared to be working nicely in OS X. I remembered that I had downloaded CPU Director from PowerLogix and was experimenting with my cache settings in OS 9. For sh_ts and giggles I decided to see if the app was designed to work in OS X. Low and behold, it does! There is a wonderful feature in CPU Director under the 'Options' tab. It's called "Enable Dynamic Power Management on Restart". This is a wonderful feature because I found the following statement on their web site regarding CPU Director and Energy Conservation.. "Dynamic power management does not result in a performance degradation and thus it is recommended that it always be enabled. On some older Macintosh models, it may not be enabled automatically by the firmware, ROM or Mac OS, so it is recommended that you use CPU Director to ensure that it is properly enabled at boot time." Quoted from the CPU Director web site at : http://www.powerlogix.com/products/cpudirector/index.html So I believe, maybe incorrectly, that when the WSI boots up, the cpu cycling isn't enabled by default. In OS9 I had turned the feature on, which was probably enabled when the Energy Saver extension was loaded. But that option doesn't exist in the Energy Saver control panel in OS X. When installing the application, it installs a kernel extension called PLKEXT. After installing it, and rebooting, I found this in my dmesg. PLKEXT: PowerLogix Kernel Extension, version 41F09 loading PLKEXT: Got machine model name"OPEN,PowerBook1998". PLKEXT: Got default CPU clock rate of 300000000 Hz. PLKEXT: Got OS release number 7.6.0. PLKEXT: Found 10.3.x or later kernel. PLKEXT: CPU 0: Initializing PLKEXT: CPU 0: Getting PVR PLKEXT: CPU 0: Getting HID0 PLKEXT: CPU 0: Getting HID1 PLKEXT: CPU 0: Getting L2CR PLKEXT: CPU 0: Getting temp PLKEXT: CPU 0: Detecting L2CR type PLKEXT: CPU 0: Registering sysctl handlers PLKEXT: PowerLogix Kernel Extension finished loading PLKEXT: CPU 0: PowerLogixL2CR (750/7400/7410) changed to 0xB5280000 The line ending in 'Getting temp' is SO DAMN USEFUL! The extension sets up some additional MIBs that you can retrieve with sysctl. Most importantly hw.PowerLogixTemp which contains the value of the CPU core temperature. I currently have a terminal running a small shell script that prints the core temperature. tcsh# cat ~/bin/temperature #!/bin/bash /usr/sbin/sysctl hw.PowerLogixTemp sleep 5 Right now, sitting on my lap in bed, the temperature is.. tcsh# repeat 9999 ~/bin/temperature hw.PowerLogixTemp: 85 So I am now successfully running OS X on a 250MHz WSI @ 300MHz. This is great! This post is more informational and for those who want to experiment with their laptop. I did update the web site with all the details about what to change for the multiplier and FSB. It is available at : http://phrax.ca/projects/OverclockPowerbookG3Wallstreet/ That's it for now. I will keep playing with this laptop. I need to determine why my fan isn't coming on. And someone in another thread suggested unplugging all power sources and the PRAM battery, but that didn't solve any problems. If you, or someone you know is running OS X on a 250 or 292MHz Wallstreet, I would like to know if your fan ever comes on, or if the machine freezes while using it. Until next time... -nils -- G-Books is sponsored by <http://lowendmac.com/> and... 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