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| Sonnet Clocker II: software extension overclock of Sonnet L2/Nubus G3 accelerators |
Posted by: Byrd on 2018-08-28 18:02:07
Hi,
Reporting on a little discussed utility that I'd forgotten about ...
http://www.zone6400.com/Sonnet_Clocker.html
Sonnet Clocker (use the rev. 1.2 version) is a utility that edits the Sonnet G3 extension to adjust the multiplier of a L2 or Nubus based Sonnet branded G3 accelerator. I'd never heard of successful software overclocking on Mac hardware, but can confirm I can overclock a Sonnet G3 400Mhz (1MB cache) L2 accelerator in my TAM to 500Mhz, as confirmed in benchmarks. Running at 500Mhz, it gets hot and I have replaced thermal grease on the card and intend to install a small fan nearby to dissipate some heat from the cramped TAM internals. Of note, it did not work at 450Mhz, I believe G3 revision and multiplier support is the key here.
Next I'll try it on a Sonnet Nubus G3 300Mhz card. Results may vary for you and on particular hardware.
JB
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Posted by: trag on 2018-08-28 21:19:59
Does it allow one to adjust the L2 cache speed ratio?
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Posted by: Byrd on 2018-08-28 22:02:19
No - multiplier speeds only. If edits the extension which you have to remove the old, and drag the edited one back into the Extensions folder.
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Posted by: Cory5412 on 2018-09-09 19:34:07
Split hardware questions into their own thread:
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Posted by: trag on 2018-09-10 14:55:33
Okay, I"ve since dug through the PPC750 datasheets and the L2 cache multiplier/divider is set in software. I wonder if this utility can be hacked to adjust other parameters. So the utility adjusts just the CPU bus multiplier, correct? That's a different parameter from the one that would adjust the cache multiplier, and cache size, unfortunately.
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