No that does not matter. Overclocking is done in the BIOS and the BIOS in laptops are generally locked. Overclocking generates more heat and that is something laptops have problems dealing with even on stock speeds. The wiki pages are a good place to start learning.
http://en.wikipedia.org/wiki/BIOS
Overclocking the RAM by itself will not really result in the computer being noticeably faster. Overclocking the processor helps much more in day to day tasks but again in laptops, unless they are specially built gaming machines you are prevented from overclocking the processor as well. This also holds true in most OEM desktop systems as well. Dell, HP and other mass market sellers do not want you to overclock so they ship all but high end gaming systems locked. They use cheap parts and they do not make any money if you can speed up your computer yourself!
http://en.wikipedia.org/wiki/Overclocking
Those of us who do overclock generally build our own computers because buying part by part results in a system that can be configured however we want. Also the higher end parts are designed to go beyond stock speeds and voltages and they can handle the higher temps that come from faster speeds.