Fan curve and operating noise (“loudness”)
Let’s now turn to what is automatically produced when the waste heat is removed: various fan noises. The measurements in the measurement chamber are, as always, a bit tricky, because you can’t measure anything through the closed side window. Therefore, I turned off the case fans and regulated the AiO to the absolute minimum. Normally I do this with a silent system in the chamber, but I didn’t want to deprive you of the possible coil whine or the somewhat fluctuating regulation of the card.
Now let’s look at the fan curves first and we understand why I couldn’t measure this to an adapted fan speed in the chamber. Because we again see a slightly jittery curve here, which regulates very much downwards over time, as long as the temperatures allow it or don’t rise significantly further.
But what does the measurement for the Sapphire Radeon RX 7700XT Pure 12GB show? You can see the lower-frequency motor peak nicely in the frequency analysis and the actual value after about 30 minutes, so the operating noise is a from-to story, which is around 34.6 dB(A) in the middle in the long-term measurement (SPL Slow). That is acceptable, especially since it gets a bit less after a while. It’s not silent, though.
Coil noise: “Coil Whining
However, we still have to talk about one point and that is the annoying coil whining. I already wrote about it in the measurement of the load peaks, that many cards perform an extremely jittery dance of joy, which you then also hear. The coils used on the Pure are quite good, but not extra class. You can see this in the high frequency once as “chirping” at around 3.2 KHz and at 5 to 7 KHz. It’s not dramatic, but you can notice it a bit at higher FPS numbers or very hard FPS changes. But it wasn’t bad.
- 1 - Introduction, technical data and technology
- 2 - Test setup and methods
- 3 - Teardown: PCB and components
- 4 - Teardown: Cooler and material analysis
- 5 - Gaming-Performance Full-HD (1920 x 1080)
- 6 - Gaming Performance WQHD (2560 x 1440)
- 7 - Details: Power consumption and balancing
- 8 - Transients and PSU recommendation
- 9 - Temperatures, clock rate and thermal imaging
- 10 - Fan curves and noise
- 11 - Summary and conclusion
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