Modified fan profile
Due to the previously explored large cooling reserves, we will now adjust the fan profile. As an idle value, we picked a speed of 30%, where you can still stay below 40°C GPU temperature even at room temperatures of up to 28°C. At a room temperature of up to 22°C, values of 20% to 25% could also be used, which then already fall into the barely perceptible range of below 32 or 34 dB(A). From about 85°C, we then let the fan speed run from 55% towards 100% at 92°C. This change is enough for the rates of well below 50% in gaming and just under 55% in load operation (stress test), which have already been documented in the video on the previous page.
The first results prove us right, because even with a modified fan profile, prolonged full-load operation is still possible without any problems:
Even though the temperatures now rise to a maximum of 86°C, these are only reached in special stress test programs and the actual value in games is much lower, which we will discuss separately later.
6 minutes stress test in diagram, picture and sound
In order to better illustrate the speed-dependent volume and the changes in the profile, we resorted to a 6-minute stress test, in which the maximum temperatures and speeds are already easily reached. The view can be easily understood both in the diagram and in the spectograms and, of course, in the video. If you want to compare a certain point in time in the diagram acoustically, you only have to jump to the desired point in time in the video:
Spectogram: Sound level
Spectogram: Frequency mixture
Interim summary
If you use the extremely large reserves of the cooler to reduce the noise, then it is one of the few higher overclocked Radeon HD 7970s that we would recommend without hesitation for a Crossfire system, especially since you could then install the two cards without spacing them apart, as long as you use a board on which the slot arrangement allows this for 3-slot cards at all. The result after the change is acceptable but not outstanding as long as you only consider GPU temperature and volume. However, the almost complete heat dissipation towards the side panel can definitely compensate for this disadvantage if you focus on performance and reserves and don’t want to heat up an air-cooled CPU with two 300 watt graphics cards additionally. This also outlines the main advantage of this design.
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