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Voltage auto decreasing during Load

Last response: in Overclocking
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Hi!

I recently bought a Hyper 212 plus to OC my Phenom II X4 955BE on my M4N68T-MV2 motherboard. My problem is when I go past 3.9Ghz, my motherboard start to automatically decreasing the voltage and the frequencies of my cpu, thus resulting in huge framedrops in games like Battlefield 3. I noticed that it happens as soon as my cpu hits around 50C on speedfan. When I'm at 3.9Ghz, I always go around 45C so that's why it doesn't do it. Any ideas? :( 

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I have an Asus GTX460 and my PSU is a CoolerMaster Extreme Power Plus 500W, I always oc my video card in gaming but even when I don't, it does the same. I'll try unplugging my video card to see if power consumption is the problem.

Edit: Removing my video card didn't change anything, so I don't think it's a power consumption problem. It just wait until it goes to 45C then the voltage and frequency go back up and drop when around 50C.
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I tried many settings in LLC, I tried 50%, 70%, 100%, 20% and 10% and none of them changed something :(  In my manual they don't even say a thing, they just tell me to put it on auto if system is unstable. It's so annoying, as soon as it reaches 50C my voltage goes down to 1.1 and my Core speed to 800mhz..

Thanks for your reply!

I see, I guess I'll stick to 3.9 Ghz... It's such a shame, I'm sure I would've got near 4.4~4.5Ghz as my cpu chip seems amazing at handling high overclock. Anyways thanks for your time, I guess I should've picked a better board to Oc
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