GPU Overclocking terms ?

I'm a new Graphic card overclocker, going to overclock my XFX 8400GS 256MB using Nvidia System Tools 6.02.
I want to ask what's the role of Core clock, Memory Clock and Shader clock of the GPU in Gaming.
Actually , i want to know how significantly each of the three clock speeds would improve the gaming performance on Overclocking ?
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More about overclocking terms
  1. you are not going to see much of a gain from that weak card.just try it for yourself 5mhz increase everytime until you get BSOD or freeze then back down the value you have increase before by 10Mhz.
  2. This will help you:

    How To Overclock Your Graphics Card

    http://www.tomshardware.com/reviews/overclock-graphics-card,1916.html
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