Power consumption in factory state as summary
The ample 13 watts in idle are ok. With a second monitor and a different resolution, it quickly becomes 34 watts and more. By the way, we can see very nicely that the full TBP of 215 watts is never really exhausted without a clock increase and only the torture test even reaches the limit here, or slightly exceeds it. Normally, it is always less. The KFA2 GeForce RTX 4070 EX Gamer 12 GB is similarly efficient as the Founders Edition with almost the same power limit. Thus, you need the same electrical power for a similar performance. Of course, you don’t have to be surprised.
Load distribution between PCIe slot and PCIe sockets
KFA2 uses the PCIe slot a lot, especially for gaming, and we know the reason: two additional voltage converters. But you are still below what is allowed with 5.5 A by the PCI SIG with the flowing currents in gaming ex-factory with the 5.3 to 5.4 A. I already wrote: You are already in the limit range with that, even if not yet above it, as long as the clock is not increased or the stress test runs. The board design is designed in such a way that an 8-pin socket works with the 200-Watt BIOSes. And that’s exactly why the mainboard slot (PEG) has to be used so intensively. With the 12VHPWR, if you were to develop that exclusively, you wouldn’t have that problem. And there is no room for a second 8-pin connector. Besides, it is quite sufficient for the MSRP card. Let’s put it this way, the 200 mA overload is unattractive but just within the tolerance range.
Rough 20 ms intervals
Let’s first have a look at the flowing currents. Measurements were taken in coarser 20 ms intervals, i.e. around 50 times per second, to simulate the load on the power supply’s supervisor chip (shutdown). We see that even short load peaks are capped at 17.5 A at the latest. but a real limitation looks different. But it can be done that way.
Nevertheless, we still have to take a look at the voltages, or the product of voltage and current flow. I already wrote that I measured here at different power supply connections, even if at the end on the board of the graphics card all connections meet again somehow. What we can now see here as much clearer fluctuations and peaks is due to the partially a little bit overvolting power supply and thus the voltage and not the currents. This is due to technical reasons, but it’s not a big deal. However, we can also see that the few peaks at around 280 to 290 watts are not caused by the flowing current (graphics card), but actually result from the power supply! This is also due to the topology and especially the rather puny input filter with only one coil on the single rail.
It hardly looks different in the torture test. The OC variant regulates a bit more hectically.
If you now add the voltage again, then you see a stronger ripple, which again results from the somewhat jittery operating voltage. However, to save the power supply’s honor, it has to be said that this affects all current products of all manufacturers and can certainly hardly be avoided.
- 1 - Introduction, technical data and technology
- 2 - Test System and the igor'sLAB MIFCOM-PC
- 3 - Teardown: PCB and components, cooler
- 4 - Gaming performance
- 5 - Details: Power consumption and load balancing
- 6 - Transients and PSU recommendation
- 7 - Temperatures, clock rates and infrared analysis
- 8 - Fan curves, noise and audio samples
- 9 - Summary and conclusion
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