No it doesn't if done correctly, i wouldn't want to try and tell you on here you would be alot better reading up on it and first and knowing a few of the basics http://www.overclockers.com/forums/s...d.php?t=263753

Mine started off @ 2.6ghz and i run it now at about 3.7ghz the difference is huge and been quad core i can run or do anything i want and it doesn't even flinch ive had it up to 4ghz but with the ram ive got it just wouldn't stay stable enough ( would crash once or twice a week ) also got my ram and gfx card overclocked to ( although the picture below doesn't show that just cpu speed )