Load peaks and capping
Let’s take a look at the flowing currents first. Measurements were taken at coarser 20-ms intervals, or about 50 times per second, to simulate the load on the power supplies’ supervisor chip (shutdown). We see that all load peaks are capped at 37 A at the latest in these still quite coarse intervals, which is fine. But if we break it down further in a moment, we will also see much higher values.
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 three different power supply connections, even if all three connections meet again somehow at the end on the board of the graphics card. What we can see here now 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 up to almost 580 watts are not caused by the flowing current (graphics card), but actually result from the power supply!
It hardly looks different in the Torture test as well, even though we see the lower peak values and especially drops here. On the other hand, the average even increases slightly.
If you now add the voltage, you’ll 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 from all manufacturers and can hardly be avoided.
But because I still want to know exactly, I’ll resolve the whole thing even higher and take 20 ms as the total runtime. The intervals of 10 microseconds are still measurable and we can see the voltage here as a gray curve, whose average value is just over 12 volts, but which nevertheless still alternates somewhat within the permissible range. But what’s striking: The real capping limit is even around 42 watts, but this is reduced to the 37 amps measured above on average over the runtime
If you then convert that to the power consumption in watts, you get this picture:
I also did the whole thing again for the torture loop, where we get to admire the regular drops. First, the currents again, but they still have lots of weird, sporadically recurring drops in each rise. This looks like a violent hiccup before the power is really throttled back shortly after.
And then total wattage again:
Power supply recommendation
Now we come to the point that completely reduces the expected sensation of exploding power supplies to absurdity. Even IF you hopelessly overpower the card, no one really needs ATX 3.0 power supplies over 1200 watts, unless the CPU eats more than 300 watts. This is really just a job creation measure for the struggling power supply industry and only satisfies the sick imagination of some standardization fetishists. You really have to put it so harshly. So, you should always stay below 800 watts even together with the CPU, if you include the load peaks up to 10 ms. Because it is what the power supplies still “see”
In this respect, I also formulate my power supply recommendation, which is for the Sapphire Nitro+ Radeon RX 7900 XTX Vapor-X 24 GB, so that you should get along with a modern 850 watt Gold or Platinum power supply quite safely, whereby with a lot of peripherals and OC, 1000 watts would certainly not be wrong.
- 1 - Introduction, technical data and technology
- 2 - Teardown: PCB and components
- 3 - Teardown: Cooler and disassembly tips
- 4 - Gaming Performance Full-HD (1920 x 1080)
- 5 - Gaming Performance WQHD (2560 x 1440)
- 6 - Summe Gaming-Performance Ultra-HD (3840 x 2160)
- 7 - Power consumption and load balacing
- 8 - Load peaks, capping and power supply recommendation
- 9 - Temperatures, clock rates and infrared analysis
- 10 - Fan curves and volume
- 11 - Summary and conclusion
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