Ok... First of all, I'm a newbie in OC.....
Recently I OC my C2Q... It doesn't went far just from 2.5GHz to 2.8GHz...
Higher than that it will result in core error...
What is the solution anyway???
Do I need to change new power supply??

add more cooling

add more voltage for cpu.... vcore

how the hell can we suggest you a new psu when there is no full system spec listed?

ok then....
My system
Proc : Core 2 Quad Q8300
Power Supply: 480W
Cooler ; cooler master Hyper N520
Gpu: Gigabyte GTS250

if you are not using a "true power" psu, please get one before you proceed with oc.

due to hardware tolerate of heat factor when oc, normal psu will blow in notime.

normally it will cost you around > 350 if you are seeking for 650w branded true power.

So there is different between true power and stock psu???.. thanks for the info!!!

heaven and earth bro.... heaven and earth.

really??? hahaha

details here bro

http://forum.lowyat.net/topic/450882

hmmmmmmmm.....

And also a oc mobo..sometime psu enough power,bt ur mobo cant supply enough power for cpu,and also get d better cpu cooler to avoid overheating ur cpu.

you psu is fine... i got only 250watt true power psu and i've succesfully overclock my pentium dual core 2180 to from 2ghz to 3ghz.. actually i could push it even further but my mobo seems to hold it back as i only had i945G chipset..

did you read up on how to overclock your pc? it's hard for us to help you if you yourself didnt do your homework and researched properly on overclocking pc's.

by the sound of it, you didnt not tweak your bios properly and that's why youre getting errors. i suggest you use the existing threads to ask this question.