How do I Manually Limit CPU Usage?

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http://askubuntu.com – I have an old laptop prone to overheating and a good solution I found was limiting it's CPU usage to below 50%. On Windows, I can do this by changing the power plan I am currently using, and altering the Minimum CPU Usage and and Maximum CPU Usage properties. Where can I do something similar on Ubuntu 12.04 LTS? (HowTos)