Update: If you look through the comments, you'll see this doesn't work for some people. If it works or doesn't work, kindly post your laptop model, then maybe we can have a list that will save people some trial and error.
My first blog about how to overlock the my T2300 was really long, and 90% of it was talking about the things that failed to work. So here's a blog with 90% of it talking about what works.
- With Clockgen or SetFSB open the PLL Setup window, and select the ICS shown in the image or ICS954123, ICS954123CGLF, ICS954227CGLF (others may work, but these are tested). Then click 'Read Clocks.'

- Find byte 09h. It's highlighted in blue. Click on it. Change it to 7F or 01111111. Click 'Update Selection' then click 'Apply Selection.'

- Open the PLL control window (if you're using ClockGen). If it looks like junk (see below) click 'Read Clocks' again.

- Now it should look normal, and display your stock clocks.

- Now just slide the slider to your desired speed and click 'Apply Selection.'

That's it.
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