Real achievable clock rates and overclocking
The real clock rates and the readout are very fancy. I coupled my own PDM with HWInfo64 because most tools don’t display the frequencies correctly. AMD speaks once of the significantly lower GPU clock and once of the so-called GPU front-end clock, which should be something like an effective clock. Interestingly, the peaks of the XFX Mercury RX 7900 XTX Magnetic Air 24 GB are significantly higher than those I measured with the reference card and the XFX Mercury RX 7900 XTX Magnetic Air 24 GB is also significantly faster overall, as it is also more constant. After all, you can reach the 2.7 GHz mark and, with maximum OC, occasionally the 3 GHz limit even under load and in Ultra HD. The cooler is also an important reason for this.
GPU temperatures in the case
The differences are not as great as feared if you use a proper case. In the end, the card doesn’t dissipate much more waste heat than the inflated predecessor models or my MSI RX 6950XT Gaming X Trio. If you close the panel, the GPU temperature (edge) rises by 1 to 2 Kelvin, the GDC hotspot rises by up to 4 Kelvin. This is all in the deep green range and looks better than AMD’s reference. We can see the full gaming load in the curve from minute 5, before that only the longer loading process and the menu (around 3 minutes) with very high FPS figures,
Infrared measurements (heat flow analysis)
Let’s start with the gaming loop and we can see that it is warmer underneath the socket than in the GPU, which is not surprising. XFX has designed the fan control very conservatively, which we will look at in more detail in the next chapter. With up to 15 Kelvin between the substrate and the underside of the PCB, we can also see how well the top is cooled. In this respect, the thermal pad below the base makes sense (around 4K less).
The temperatures rise only slightly in the stress test, but the same applies here. A very successful balancing act between cooling performance and fan noise.
- 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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