Power consumption during gaming
Let’s now move on to the power consumption in games, where the TBP of “only” 320 watts very quickly proves to be reasonable, depending on the resolution and feature set of course. In QHD, the new card is more frugal on average than a Radeon RX 6800XT. However, the Founders Edition still has a slight advantage here, even if it is marginal. This is then their advantage of slightly better components.
Even in Ultra-HD without CPU limit, it is only just behind the GeForce RTX 4080 FE, which was to be expected. However, I’ll come to the efficiency analysis across all cards and resolutions later. This is first about the wattage numbers and they are still more than just pleasing.
If you use the supersampling helpers, the picture is reversed because the actually powerful CPU is slightly limited again. But we can also state here that the new GeForce RTX 4080 is the measure of all things when you put everything in relation to the achieved gaming performance.
Power consumption in factory state as summary
The idle power consumption, which is around 14 watts (thanks to the new AGESA), is okay since the GPU is now heavily downclocked. The few watts for the LED are rather uncritical.
We can see from the BIOS limits that the card comes to the customer with a preset power limit of 320 watts, although the limit can be raised further to 420 watts manually.
Load sharing between PCIe slot and external 12VHPWR connector
KFA2 has all 8 phases or the controlled 16 control loops connected to the 12VHPWR, which makes sense that way. The PCI-SIG says in the PCIe 5.0 specification that the card may consume a maximum of 600 watts of power in the sum of all 12V connections. This will never be achieved, but would still leave many reserves within the permissible tolerances even in this design. Instead of the maximum possible 5.5 A, it is only 1.1 A in the measurements, even in extreme cases, which is about 13 watts. The card should generate various extra-low voltages here, which hardly change as a load even when overclocking.
The main load is thus almost exclusively via the 12+4 pin connector (12VHPWR), whose contacts got up to 38 °C hot after about 1 hour of full load during operation with the 3-pin adapter (3x 6+2) on the card. However, the circuit board where the connection is soldered has already reached a temperature of over 38 °C. It’s not really all that evil yet.
- 1 - Einführung, technische Daten und Technologie
- 2 - Test System im igor'sLAB MIFCOM-PC
- 3 - Teardown: Platine und Kühler
- 4 - Gaming-Performance
- 5 - Leistungsaufnahme und Lastverteilung
- 6 - Lastspitzen, Kappung und Netzteilempfehlung
- 7 - Temperaturen, Taktraten, Lüfter und Lautstärke
- 8 - Zusammenfassung und Fazit
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