For our OC testing, we have configured our CPU to run 4100MHz on all cores and set the voltage to 1.3875V. This yields an approximate power at the wall of 255w under load (a 197w differential from idle, which pulls about 58w). This results in the CPU running at 4.1GHz on all cores during the looping rounds of Cinebench R20.
One thing to note is that the Sickleflow fans used by the MasterAir MA624 registered a minimum of 750RPM and a maximum of 1450RPM on our test rig. Therefore, the 100% Fan and 1500 RPM fan speed tests are operating at 1450 RPM and the 600 RPM fan speed test is operating at 750RPM.
Running our HSFs at full tilt leads to the Cooler Master MasterAir MA624 Stealth posting a temperature of 75.5 degrees Celsius which allows it to take the lead over the rest of the field. The Cooler Master Hyper 212 EVO (77.38 degrees Celsius) and be quiet! Dark Pro 4 (78 degrees Celsius) brought up the middle of the pack and the IceSLEET X7 Dual at the rear, posting a temperature of 79 degrees Celsius.
We noted that the max fan speed on the Cooler Master MasterAir MA624 Stealth topped out at 1450 RPM, Cooler Master Hyper 212 EVO topped out at 2050 RPM, the Iceberg Thermal IceSLEET X7 Dual topped out at 1600 RPM, and the be quiet! Dark Rock Pro 4 has the second-lowest max fan rpm at 1500 RPM.
1500 RPM Fans
Dropping the fans slightly to 1,500 RPM actually meant dropping the fan speeds of the Hyper 212 EVO and IceSLEET X7 Dual to 1500 RPM as the MasterAir MA624 and Dark Rock Pro 4 were already there.
At the 1500 RPM fan speed, the Cooler Master MasterAir MA624 Stealth leads all challengers at 75.5 degrees Celsius. Next up, the be quiet! Dark Rock Pro 4 checks in at 78 degrees Celsius while the Cooler Master Hyper 212 EVO posted a value of 79.75 degrees Celsius. The Iceberg Thermal IceSLEET X7 Dual was right on the Hyper 212 EVO’s heels at 79.88 degrees Celsius.
1000 RPM Fans
At the 1000 RPM fan speed, the Cooler Master MasterAir MA624 Stealth posted a temperature of 78.5 degrees Celsius, and be quiet! Dark Rock Pro 4 posted a value of 82.5 degrees Celsius. The Cooler Master Hyper 212 EVO and Iceberg Thermal IceSLEET X7 Dual failed to keep the temperature in check here and our system crashed.
600 RPM Fans
With the fans down to minimum levels (in the MA624’s case, 750RPM), the Cooler Master MasterAir MA624 Stealth posted a temperature of 83.75 degrees Celsius. This is the first cooler when set to its minimum fan RPM to allow our test bench to remain stable during testing in the overclocked scenario. This is met with somewhat of a furrowed eyebrow, as the posted temperature, while stable, in this case, is often right around the level that crashes the test bench. Either way, this is a fairly impressive feat.
Now that we have seen how all of our units cool, let’s see if we can still hear!