be quiet! Silent Loop 360 review

Cooling 189 Page 9 of 11 Published by

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Core i7 4790K OC at 4600 MHz 1.3 Volts

The Next Chapter - Overclocking

Now we up the ante and boost 1.3 Volts into the processor. Understand that 1.3V and higher voltages are the levels where Haswell processors get into serious problems due to the heat-spreader versus TIM applied solution from Intel. We now set the Core i7 4790K @ 4600 MHz and apply 1.30 volts on the CPU while loading it with 100% stress for wPrime to run on all available CPU threads three times.

Core i7 4790K OC at 4600 MHz 1.3 Volts

Below, you can see the IDLE results with the Core i7 4790K clocked at 4600 GHz with 1.30 volts on the CPU. Again, the results are the IDLE temperatures thus you are in your desktop doing pretty much nothing. 

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The temps normally rise above and beyond 90 Degrees C for a lot of heat-pipe based coolers, which is a definite no-no. As you can see, we have near dangerous temperatures for most coolers. The reality is that very few coolers and kits can actually manage a Core i7 4970K @ 1.3+ Volts / 4600+ MHz temperature wise. 

Extended Tweaking

Since this solution harbors extra cooling capacity I extended overclocking to higher voltages as well. 

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The above numbers are for reference only, i.e. how does a 4790K behave with increased voltages at a 4600 MHz clock frequency? We can run the unit at 1.40 Volts  on the processor (which is an awful lot for this CPU). At this stage the system still boots and can finish two wPrime stress runs. Typically at ~1.350 Volts and with a good enough processor, you are in the 5 GHz range (if your CPU is capable).  After 1.35 Volts the fans will start to spin much faster though, We'll look at that in the DBA measurements though. At 1.45 Volts on the CPU the processor starts to overheat and here things will become downright noisy. 

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