Core speed jumps under full load ?

hi every 1 , i just built a new set-up. cannot get this thing to o`c ... i tried im new to oc. i dont no what to keep on auto / disable / enable , voltage ect ect... my 1si try i did 4.5 GHz booted and evrything was working fine. opened up cpuid / intel burn test. started test voltage was good , but cpu idles at 1600 - then when i put load hits the 4.5 ghz for a few sec`s then drops down to factory 3.5 ghz . i dont wanna fry nothing so thats why im here..i need a guide / tuturial / video to let me know what i should keep on auto / disable / enable / voltage...plzz help guys with anything.. thank you :hello: :o :ouch: :bounce: :sarcastic: plzzzzz help me

heres the specs

i7-2700k cpu / with Contac 30 CPU Cooler 120mm fan = works very well

asrock Z77 pro 4 - m motherboard / all bios and up to date.

corsair Vengeance Series memory modules, 8GB (2x4GB) 1866MHz

MKX-850W 850 Watt PSU

Seagate - Barracuda 1TB HDD

EVGA GeForce GTX 590 (Fermi) Classified 3072MB 768-bit GDDR5 video card

Rosewill GEAR X3 Gaming Tower - 1 . 140mm / 5 - 120mm fans
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More about core speed jumps full load
  1. how hot is it getting, if it's hitting TJunction that would explain the drop
  2. its not running hot at all about 30c idle 55c full load
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