When you overclock, you raise the FSB up, which increases the CPU and RAM at the same time. So, in order to overclock your CPU to its full potential, you have to set your RAM to a slower speed that it is supposed to run at. This is called running your memory on a divider. For instance, while overclocking my DDR2-667 memory, I would set it to run at DDR2-533. Then, I would raise the FSB until the system is unstable: While running CPU intensive tasks, the system will crash, or freeze up. Once you get there, you can increase voltages a very slight bit if you want to, though increasing the voltages to high is what usually cause people to fry their CPUs.
One last note: You may or may not reach 2.4Ghz; it all depends on your processor, motherboard, and memory. Even between identical setups, the amount of overclocking that is possible will vary.
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