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i7 920 overclock issue

post #1 of 3
Thread Starter 
Made my first attempt at overclocking. Followed the quick and dirty 4GHz method found here http://www.overclock.net/t/538439/guide-to-overclocking-the-core-i7-920-or-930-to-4-GHz
Everything went really well ran prime and occt for a couple of hours each and no issues. Or so I thought. Only closer inspection after around 10 mins of the stress test the clock speed drops massively resulting in an under-clock of around 15% as shown in this graph:

2013-09-22-15h36-Frequency-CPU #0.png 28k .png file .

Speedstep is disabled so no idea what's going on. can anyone help?

cpu-z.png 61k .png file
post #2 of 3
What are your temps like?
post #3 of 3
Thread Starter 
Sorry meant to include temp graph also

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