The Test System and Thermal Results
I would first like to thank HIS, GIGABYTE , InWin and AVADirect for supplying products for me to test with.
Testing for the CPU coolers is done with the use of RealTemp to ascertain temperatures, Intel Burn Test to deliver the load to the CPU and CPU-Z to verify the CPU speed and the voltage being used in Windows. All of the testing is done with an ambient temperature of 24.5-25�C and humidity is maintained to 35% sometimes less.
For the "stock" runs, it's more of a plug and play setup where the PWM of the motherboard is in control of the fans speeds for both the idle and load results. Speed Step is active and the processor idles at 1600 MHz and loads at 3500 MHz for the stock settings. I also set the memory to run at 1600 MHz for stock. As for the overclocked runs, I load the CPU at 4.5 GHz and idle results are obtained with 7.5V to the fans while the load run is set to deliver 12V to the fans. This allows me to gauge the lowest and highest fan ratings for my charts.
You will also see that the charts have been slightly adjusted. From now on I will mention the idle temperatures if there is something worth noting other than an average of twenty-five to twenty-seven degrees as the PWM controls and Speed Step allow for almost ambient results in most instances. What you are now getting is a stock speed loaded temperature chart and an overclocked loaded temperature chart. To clean up the audio results, I also removed all of the fans that aren't on the thermal charts. If you want to compare those results to new coolers, the old chart is still available in the older reviews.
The 51 degree result may look mediocre, but in reality, the best air cooler I have tested was only four degrees in front. Considering the PWM was still in control and the fan was spinning really slowly, these results are actually pretty good.
The Grand Kama Cross 2 doesn't waver one bit when it came to the overclocked testing. Even here with the fan turning at full speed, the cooler is still only four degrees behind the best solution of air cooling listed on the chart. 72 degrees may look a bit warm, but with a range of near 60 at the low-end of water cooling, and near throttling levels at the top end, the GKC2 is an admirable contender for your money.