Mac mini 1.58 overclock correction in About This Mac

[DanielNTX]

I've update my OpenFirmware scripting instuctions for those who overclocked their Mac mini's to 1.58GHz and don't want 750MHz displayed in About This Mac and in Xbench's L2 Cache speed.

If you want to read more about this work: read this thread

Here it is:

Here's how to fix About This Mac, More Info... and also the L2 Cache reported speed in Xbench:

These are the values for 1.58GHz overclock:
1.58 GHz PowerPC G4
5e2ce2fd = 1579999997 = " clock frequency"
5e1da0c0 = 1579000000 = " rounded-clock-frequency"
5e178682 = 1578600066 = " recalced-clock-frequency"

Here's the instructions on how to persist the 1.58GHz into the system so that "About This Mac" works properly:
1. Reboot the computer holding down Cmd-Opt-O-F to enter the Open Firmware command line.
2. Type nvedit and press Return
3. Enter the following script exactly, pressing Return at the end of each line.

dev /
9eb18ef encode-int " clock-frequency" property
dev /cpus
dev PowerPC,G4@0
5e2ce2fd encode-int " clock-frequency" property
9eb18ef encode-int " bus-frequency" property
5e1da0c0 encode-int " rounded-clock-frequency" property
5e178682 encode-int " recalced-clock-frequency" property
27ac63b encode-int " timebase-frequency" property
dev l2-cache
5e2ce2fd encode-int " clock-frequency" property
dev /

4. Press Ctrl-C to exit the editor.
5. Type nvstore and press Return
6. Type setenv use-nvramrc? true and then press Return
7. Type reset-all and press Return

- Daniel

 

[Killer-X-]

I am interested in testing this on my powermac G4, dual 800mhz. I was wondering if you knew the code for 1.2ghz? I dont want to put in 1.58ghz values, I think that would be too high for it. maybe even 1.0ghz?