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 SpeedStep 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.
When loading the 2600K at stock levels, the X40 does quite well. With a 47 degree result here, the X40 jumps into fourth place overall. For this test the pump was at 3000 RPM, the fan reached 1150 RPM, and the highest coolant temperature I saw during the runs was 33 degrees.
Once the overclock was applied and the tests run, the X40 does drop a few places, and you can see where the dual radiator units pull slightly ahead of this. A top ten result is very good for any cooler, and 68 degrees is very respectable. For this test I used the extreme setting of the software which pushed the pump to 3200 RPM at times, allowed the fans to spin at only 1700 RPM - I could not make them reach the 2000 RPM advertised speed. As for the coolant temperature, at this point I saw results just below 38 degrees.