The tests on the AMD system with the Ryzen 9 3900X show, unlike the Intel system, exactly the difference between the push and push-pull systems, which I have already pointed out several times. In the pure temperature evaluation, the story still looks partially balanced, but the Casus Knacktus is already lurking in the bushes. But more on that. Due to the high heat flux density, conventional water cooling is also pushing to its limits, which can hardly be set off from the Noctua NH-U12A in push-pull mode.
This is mainly due to the very fast and efficient heatpipes, which get the waste heat away from the heat sink quite quickly. A normal water block does not perform much better at such a punctual, asymmetric load. The fact that 185 watts is the end is due to the room temperature of 22 degrees and the resulting delta, which is similarly high in water cooling, as long as the chiller does not come into play and dramatically reduces the point of thermal resistance at this transition point. But I'm not testing it today.
The fact that the push operation performs so well with only one fan is also due to the significantly higher speed that the curve forces for the temperature specification. You stay similarly cool, but now you have to let the individual fan rotate significantly higher. At 125 watts, you can already reach almost the maximum speeds of the fans, which also explains the curve curve.
If you look at the noise emission now, these curves are of course the logical consequence of what I have just shown. A fan is of course always a little quieter than two, but the difference is really limited.
Noctua NH-U12A
 | Zentrallager: verfügbar, Lieferung 3-5 WerktageFiliale Wilhelmshaven: nicht lagerndStand: 19.04.24 14:18 | 115,59 €*Stand: 19.04.24 14:19 |
 | ab Lager | 115,60 €*Stand: 19.04.24 14:10 |
 | Versandbereit: Lieferzeit 3-6 Werktage | 119,25 €*Stand: 19.04.24 14:13 |
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