Fan curve and operating noise (“volume”)
Now we come to what is automatically generated when the waste heat is dissipated: various fan noises. As always, the measurements in the measurement chamber are a bit tricky, because you can’t measure anything through the closed side window. That’s why I switched off the case fans and set the AiO to the absolute minimum. Then they are drowned out by the noise of the XFX Mercury RX 7900 XTX Magnetic Air 24 GB. Normally I do this with a silent system in the chamber, but I didn’t want to deprive you of the somewhat fluctuating regulation of the card.
Let’s first look at the fan curves and we’ll understand why I couldn’t measure this with an adapted fan speed in the chamber. Because here again we see a very jittery curve between 1250 and 1310 rpm, which reacts very nervously to all load changes. The manufacturer could perhaps make improvements here, even if it is not extremely loud. But up to 400 watts need to be tamed, and this has been done very well.
But what does the acoustic measurement for the XFX Mercury RX 7900 XTX Magnetic Air 24 GB reveal? The frequency analysis clearly shows where the (motor peak) lies, so that the operating noise is a rather broadband story, which is around 36.3 dB(A) in the middle of the long-term measurement (SPL Slow). This is perfectly acceptable, but not ultra-quiet either. Ok, but it is of course appropriate for the almost 400 watts. But we can also see very nicely how the fans with the fan speeds up to around 2 KHz and the coil noise from around 3.5 KHz are visually represented.
Coil noise: “Coil whining”
However, there is one point we still need to talk about and that is the annoying coil whining. I already wrote in the measurement of the load peaks that the cards perform an extremely jittery dance of joy, which you can also hear. Especially as the coils used are good, but not top class. You can hear the “buzzing” as a straight line at approx. 250 Hz and again as a “chirping” at 3 to 6 KHz in the high frequencies. This is not dramatic, but you can certainly hear it at higher FPS numbers or hard FPS changes. I deliberately did not normalize the recording from the measurement microphone because otherwise it would appear louder than it is.
- 1 - Einführung, technische Daten und Technologie
- 2 - Test Setup
- 3 - Teardown: PCB, Topologie und Komponenten
- 4 - Teardown: Lüftersystem und Kühler
- 5 - Teardown: Material-Analyse
- 6 - Gaming Performance WQHD (2560 x 1440)
- 7 - Gaming Performance Ultra-HD (3840 x 2160)
- 8 - Gaming Performance FSR vs. DLSS
- 9 - Details: Leistungsaufnahme und Lastverteilung
- 10 - Lastspitzen, Kappung und Netzteilempfehlung
- 11 - Temperaturen, Taktraten und Infrarot-Analyse
- 12 - Lüfterkurven und Lautstärke
- 13 - Zusammenfassung und Fazit
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