Power consumption during gaming
Let’s now move on to the power consumption in games, where the TBP of “only” 450 watts very quickly proves to be reasonable, depending on the resolution and feature set of course. In QHD, the new card is as thirsty as a GeForce RTX 3080 10GB on average, which may certainly also be due to the CPU limiting, but it also indicates an enormously increased efficiency. However, the Founders Edition still has a slight advantage here, even if it is marginal. After all, it is also somewhat slower.
Even in Ultra-HD without a CPU limit, it is only just behind the GeForce RTX 3090 and the FE, which is again astonishing. However, I’ll come to the efficiency analysis across all cards and resolutions later. First of all, it’s about the wattage numbers and they are still more than just pleasing despite the slight OC.
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 4090 is the measure of all things when you put everything in relation to the gaming performance achieved, because even the slightly overclocked KFA2 GeForce RTX 4090 SG 24GB is even more restrained than the old RTX 3090 FE.
Power consumption in factory state as summary
What is a real step backwards from my point of view is the very high power consumption at idle, which rarely falls below 34 watts even when the GPU is heavily downclocked. The few watts for the LED are rather uncritical, so I would rather attribute the high value to the much too infrequent downclocking of the PCIe slot in idle, especially since countless programs now rely on the hardware acceleration via the GPU.
We can see from the BIOS limits that the card comes to the customer with a preset power limit of 450 watts, whereby the limit cannot be raised further manually.
Load sharing between PCIe slot and external 12VHPWR connector
KFA2 has all 9 phases or the controlled 18 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’s only 1.3 A in the measurements, even in extreme cases, which is about 15.6 watts. The card should generate various 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 74 °C hot after about 1 hour of full load during operation with the 3-pin adapter (3x 6+2) on the card. However, the board where the connector is soldered has already reached a temperature of more than 67 °C by then. All this is not really evil yet.
- 1 - Introduction, technical data and technology
- 2 - Test System and the igor'sLAB MIFCOM-PC
- 3 - Teardown: PCB and cooler
- 4 - Gaming Performance
- 5 - Power Consumption and load balancing
- 6 - Transients and PSU recommendation
- 7 - Temperatures, clock rates, fans and noise
- 8 - Efficiency. summary and conclusion
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