Core i7 4790K OC At 4600 MHz 1.3 Volts
Now we up the ante. Understand that 1.30 Volts and higher voltages is the threshold where Haswell processors like the one used today get into serious problems due to a rather half asses 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 1024M to run on all available CPU threads three times.
Core i7 4790K OC At 4600 MHz 1.3 Volts - IDLE
Below, you can see the IDLE results with the Core i7 clocked at 4790K @ 4,600 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.
The temps normally rise above and beyond 90 Degrees C for a lot of heatpipe based coolers, which is a definitive no-no. As you can see, we have dangerous temperatures for most heatpipe coolers. Few coolers and kits can actually manage a Core i7 4970K @ 1.3+ Volts / 4,600+ MHz temperature wise well enough.
The performance mode again, is silent! And it does make all the difference as a 73 Degrees C stress temperature on a 1,024 M Prime run is just really good. And since this is looking really good, let's up the ante and run her up-to 1.45 Volts:
The above numbers are just for reference only e.g. how does a 4790K behave with increased voltages at a 4600 MHz clock frequency. We test at the NZXT CAM Performance mode configuration for these overclocks.
We can run the unit towards 1.40 Volts on the processor (which is EXTREME for this CPU!). At this stage the system still boots and can finish wPrime stress runs. Typically at ~1.350 Volts and 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 a notch faster but the unit remains silent. Overall the overclocked cooling capacity is very impressive for the Kraken X42 considering this is mereley a 140 mm LCS cooler.