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Gaming performance is important and all, but c’mon, this graphics card—and this review—are really all about the noise levels. You’re here to see whether this card lives up to Noctua’s reputation for high performance and low noise levels.
We measure noise with a calibrated Triplett SLM-400 meter on a tripod placed one meter from our open test bench. Our testing environment is a typical carpeted room with no specialized acoustic treatment. All other possible noise sources in the room are shut down, unplugged, or otherwise minimized prior to testing.
The noise floor of our testing environment, as indicated by our meter, is 32.6 dBA. Both the RTX 5080 Noctua Edition and the Founders Edition stop their fans at idle, so they’re no louder than the ambient environment.
Fire up a gaming load, however, and the Noctua card increases the noise levels of our test environment by just 0.3 dBA, whether stock or overclocked. That’s an incredible acoustic performance, and while it’s not technically silent, it’s likely as good as you’re going to get from anything with fans.
Recall that dBA is a logarithmic scale, so small absolute changes here indicate large changes in loudness. The Founders Edition card is quite a bit louder to the ear than the Noctua Edition, especially when overclocked. To even hear the Noctua Edition’s fans, I have to place my ear right next to the side of the card, at which point you can hear the very slightest hum of fans spinning and a whisper of air moving.
But with noise levels this low, basically any other sound is going to be louder than the Noctua Edition 5080, especially if you’re gaming. Your breathing will be louder, HVAC systems will be louder, keypresses will be louder, mouse movements will be louder, airplanes overhead will be louder, passing cars will be louder, and birdsong will be louder. You get the point.
Unless you’re playing game audio through $10,000-a-side speakers in an acoustically treated room with your PC in the same space and demand the absolute lowest possible noise floor as a canvas for your audiophile gear, the satisfaction of a graphics card this quiet is an extremely particular one.
But if you’re hell-bent on building as fast and quiet a gaming PC as is possible, you will have the satisfaction of knowing that this RTX 5080 is delivering its incredible performance while remaining practically imperceptible to the ear in return.
It’s worth noting that Asus provides a dual-mode BIOS switch on this card that offers a Quiet vBIOS in addition to the default Performance, but we didn’t run it through our full suite of tests because we only saw a 0.1 dBA difference in its favor on our noise meter when we loaded up our gaming tests. If you have ears that sensitive, though, the option is available.
dBA readings alone don’t tell the entire story of what it’s like to use a graphics card, of course. Using a frequency analyzer, we can break down the components of a card’s noise character and show just how broad-spectrum or tonal it is – and where those tones fall on the audible spectrum.
The GeForce RTX 5080 Founders Edition’s noise character is generally broad-spectrum, but it exhibits a prominent spike around 170Hz on our analyzer that comes across as a low tonal hum. It also has quite a bit of high-pitched coil whine (potentially appearing around 5KHz) that varies with output frame rates.
By the same measure, the Noctua Edition RTX 5080’s sonic signature is essentially broad-spectrum, aside from some coil whine that is more perceptible than the card’s otherwise incredible SPL measurements would suggest (note the vast difference in Y-axis scale between the two cards here).
If Asus were somehow able to source inductors that were buzz-free at the switching frequencies demanded by a GPU VRM, this card would be practically silent. But that noise remains the one challenge standing in the way of sonic perfection from this card, and the buzz it produces would still be audible even if it were somehow passively cooled.
Thermal performance
With its default Performance vBIOS, the Noctua Edition RTX 5080 runs just 4 °C cooler than the dual-slot RTX 5080 Founders Edition across all of our gaming workloads. Frankly, we were expecting a bit more of a delta between these two cards, given the Noctua Edition’s massive size and weight. But that’s a mostly academic desire, since performance is already slightly higher and noise levels are so much lower than the Founders Edition at stock.
Our manual overclock also produces only a 0.5 °C rise in temperatures compared to the default vBIOS settings. Usually, overclocking requires tradeoffs in power consumption, noise levels, or temperatures, but in the instance of this RTX 5080, the performance gains you get are practically free.
If we normalize noise levels to 37 dBA at one meter between these cards by greatly raising fan speeds on the Noctua Edition with our manual overclocks applied to both cards, the true strength of the Noctua Edition cooler becomes more obvious. Load temperatures drop to just 51.3 °C under our manual overclock, or a full 14 °C lower than the FE card under the same conditions.
Overall, our thermal and noise test results are highly complimentary of Asus and Noctua’s engineering efforts here. To produce a card this quiet and fast while sacrificing nothing is an impressive achievement.
At the same time, these results show just how much it takes to improve on the RTX 5080 Founders Edition cooler. Sure, the FE is louder and slightly warmer-running, but it also weighs a kilogram less, occupies just one-third the volume, and delivers largely the same gaming performance as this Noctua Edition. If you demand better, you’re going to pay for it in size, weight, and a much larger price tag.
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