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safe voltage? haswell

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Yes. Up to 1.35v is perfectly fine.

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yes, anything up to 1.4V is ok for 24/7 according to Intel.

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Yes. Anything below 1.3v on Haswell is good.

 

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0V-1.3V For people concerned about volts\heat. up to 1.3V is playing it SAFE. be happy with your clocks at 1.3V. using an air cooler. I have found that up to 1.3V will offer the best performance ratio in terms of GHz\Watt

 

1.3V-1.44V Still safe without risking CPU degradation . Requires a good cooling solution ( top notch AIO cooler) NOT recommended for people using air cooling or people concerned with heat or volts applied

 

1.45V and Higher. For extreme Overclockers only. from my testing going over 1.45V to achieve higher clock speeds is pointless. the performance\Watt drops heavily and massive amounts of heat is generated.Not Recommended

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