When it comes to power consumption, the KFA2 GeForce RTX 4090 SG is no exception when compared to other GeForce RTX 4090 models. At 450 watts, the standard power limit is about as high as other RTX 4090 models. On the other hand, with the optional power target, there are differences between the different models. With an addition of 13 percent, you can increase the KFA2 GeForce RTX 4090 SG’s power limit to around 510 watts. Even Nvidia’s Founders Edition allows for up to 600 watts and the Palit GeForce RTX 4090 GameRock OC only 500 watts. However, in practice this is of secondary importance, because the power limit of 450 watts is rarely reached. Just over 370 watts are consumed in the FurMark stress test. The GPU temperature is a cool 65 degrees Celsius and the fans spin at just 1,300 RPM. The graphics card is heard quietly at 39 dB (A).
The KFA2 GeForce RTX 4090 SG relies on a massive heat sink with three large 102mm axial fans. Another 102mm fan can be installed in the back as an option. Here, however, you should pay attention to compatibility with the motherboard used. In our case, the extra fan could not be fitted because the Gigabyte X670E Aorus Master’s RAM banks prevented it.
If we compare the power consumption of the entire test system, it is around 546W when gaming. That’s only slightly more than compared to the Nvidia GeForce RTX 3090 Founders Edition. However, we see a significant increase in performance, which means that the GeForce RTX 4090 takes a big step forward in terms of performance per watt. However, we also recorded peak loads of up to 700 watts for our test system. KFA2 specifies a minimum power supply output of 850W for GeForce RTX 4090 SG. On the other hand, some other manufacturers use at least 1000 watts, which we think is quite high.
As far as the 12VHPWR connection is concerned, we would like to point out at this point that you must ensure that the plug is correctly and completely inserted into the socket. There are no issues with all the RTX 4090 models we’ve tested so far and we still own them.
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