Since the various turbo technologies are becoming more and more advanced, sufficient cooling to keep clock speeds at a high level is becoming more relevant for the actual performance of the cards during gaming sessions. If a card were to start thermal throttling after a couple of minutes, the performance would naturally decrease as well. For this reason we're now also performing a throttling test, that will determine whether the performance of a card stays consistent, even after a long period of gaming.
The throttling test consists of our F1 2015 benchmark, looped seventeen times, which takes about 30 minutes. In the meantime we monitor the clock speeds and temperatures by writing them off to a log file each second. Afterwards we analyze the data, to make the graph below.
Clock speed and temperatures
The KalmX becomes hotter slowly and seems to stabilize after about 15 minutes. In the end the KalmX reaches 94 degrees. This is hotter than what we're used to seeing from cards that are cooled actively, however the passive cooling is enough to keep the clock speed at about 1600 MHz. It should be noted that this is achieved with practically no airflow. Temperatures decreased to about 61 degrees with the airflow of a single case fan.
|0-2 min||1663 MHz|
|2-5 min||1642 MHz|
|5-10 min||1618 MHz|
|10-20 min||1594 MHz|
|20-28 min||1592 MHz|