Core i7 4790K OC at 4600 MHz 1.3 Volts

Now we up the ante. Understand that 1.3V and higher voltages are the levels where Haswell processors get into serious problems due to the aforementioned heat-spreader versus TIM design 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. Below, you can see the IDLE results with the Core i7 clocked at 4790K @ 4600 GHz with 1.30 volts on the CPU. Again, the results are the IDLE temperatures thus you are on your desktop doing pretty much nothing. 

The temps normally rise above and beyond 90 Degrees C for a lot of heatpipe based coolers, which is a definitive no-go. As you can see, we have dangerous temperatures for most coolers.

LCS class coolers perform far better here and the Kraken X72 hold ground extremely well. You could give the fans a higher RPM level, which probably will shave off a couple of degrees. Few coolers and kits can actually manage a Core i7 4970K @ 1.3+ Volts / 4600+ MHz  So these are pretty impressive results, let's up the anty and fire off even higher voltages at the processor:

 
To advance on overclocking to see where our thermal threshold (the point of no return) is we tweak in five stages where we up the core voltage from 1.30v upwards to a totally unrealistic 1.45v. Normally we can hardly reach 1.40v with any cooler with this processor, however, the X72 did allow me to reach 1.45 Volts stable (which is crazy for this CPU). That means there is a lot of cooling capacity available in this LCS unit. As you can see, up-to 1.40 Volts I'd be able to run very comfortably.

Performance relative to temperatures and DBA levels based on FAN settings

In this last chart, we still apply the up to 1.45 Volts overclock on the CPU and put it under load. We use the performance mode profile settings and look at the behaviorists in terms of temperatures and DBa levels.