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. Then they go down in the noise carpet of the Sapphire Nitro+ Radeon RX 7900 XTX Vapor-X 24 GB. Normally I do this with a silent system in the chamber, but I didn’t want to deprive you of the coil whine, nor 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 see here again an extremely jittery curve between 1400 and 1500 rpm, which reacts very nervously to all load changes. The manufacturer could improve this, because you can definitely notice it, even if you don’t hear it extremely loud. But 400 watts want to be tamed.
But what does the acoustic measurement for the Sapphire Nitro+ Radeon RX 7900 XTX Vapor-X 24 GB show? You can see nicely from the frequency analysis how the fan’s speed changes (motor peak), so that the operating noise is a from-to story, which is around 34.7 dB(A) in the middle in the long-term measurement (SPL Slow). That’s acceptable, but not ultra-quiet. Okay, it’s still quiet, though. But we can also see very nicely how the fan noise changes almost synchronously coupled with the fan speeds up to around 1.5 KHz and the coil noise from around 3 KHz.
Fan fluctuations are also measurable in the stress test (also slightly audible), but the voltage converter noise is rather constant and only becomes audible from about 6 KHz.
Coil whining noise
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 the cards perform an extremely jittery dance of joy, which you can then also hear. Especially since the coils used are good, but not extra class. You can see the “buzzing” as a straight line at about 250 Hz and in the high frequency again as a “chirping” at 3 to 6 KHz. This is not dramatic, but you can definitely notice 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 - Introduction, technical data and technology
- 2 - Teardown: PCB and components
- 3 - Teardown: Cooler and disassembly tips
- 4 - Gaming Performance Full-HD (1920 x 1080)
- 5 - Gaming Performance WQHD (2560 x 1440)
- 6 - Summe Gaming-Performance Ultra-HD (3840 x 2160)
- 7 - Power consumption and load balacing
- 8 - Load peaks, capping and power supply recommendation
- 9 - Temperatures, clock rates and infrared analysis
- 10 - Fan curves and volume
- 11 - Summary and conclusion
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