What does Overclock (OC) means?

Overclocking is the process of running a computer component at a higher clock rate (more clock cycles per second) than it was designed for or was specified by the manufacturer, usually practiced by enthusiasts seeking an increase in the performance of their computers. Some purchase low-end computer components which they then overclock to higher clock rates, or overclock high-end components to attain levels of performance beyond the specified values. Others overclock outdated components to keep pace with new system requirements, rather than purchasing new hardware.[1]

People who overclock their components mainly focus their efforts on processors, video cards, motherboard chipsets, and random-access memory (RAM). It is done through manipulating the CPU multiplier and the motherboard's front side bus (FSB) clock rate until a maximum stable operating frequency is reached, although with the introduction of Intel's new X58 chipset and the Core i7 processor, the front side bus has been replaced with the QPI (Quick Path Interconnect); often this is called the Baseclock (BCLK). While the idea is simple, variation in the electrical and physical characteristics of computing systems complicates the process. CPU multipliers, bus dividers, voltages, thermal loads, cooling techniques and several other factors such as individual semiconductor clock and thermal tolerances can affect it. Every component has its unique limits with higher clocks and voltage. Two different CPUs may clock completely differently, one being stable with higher clocks at a similar temperature as the other. The bus and memory stability and tolerances also affect how stable an overclocking can be.[2]
Source Wiki

For more detailed info refer to the link below
http://www.webopedia.com/DidYouKnow/Comput...verclocking.asp

The tutorial on how to OC is in the spoiler below ( Guide tested by Aspire2oo6)
currently trying to OC my N900 and I'm stuck at step 7, it says fiasco-image-update /home/user/MyDocs/zImage800.fiasco does not exist, skipping

Can anybody tell me what is the matter?

This post has been edited by DaGlue: May 31 2010, 10:33 PM

By the way i was thinking to share this vclip,its not related to N900 but then worth watching.
http://www.youtube.com/watch?v=udlxr8t1nZM