Load peaks and capping
Let’s first take a look at the flowing currents. Measurements were taken at coarser 20-ms intervals, or about 50 times per second, to simulate the load on the supervisor chip of the power supplies (shutdown). We see that ALL load peaks are capped at 30 A at the latest, which is fine.
Nevertheless, we still need 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 a lot of 400 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, 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 can just be measured sensibly and we also see the voltage here as a gray curve, whose average value is just over 12 volts, but which nevertheless still alternates a bit within the permissible range.
If you then convert this 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 1000 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 600 to 700 watts even together with the CPU, if you count up to 10 ms. Because it is what the power supplies still “see”
This is also the reason for my power supply recommendation, which for the Sapphire Radeon RX 7700 XT 12GB is that you should be able to get by with a modern 600 watt Gold or Platinum power supply. If you want to overclock, you should plan another 50 to 100 watts more, which is especially true for such board partner cards.
be quiet! |
Straight Power 11 650 Watt Gold |
Sharkoon |
Silent Storm Cool Zero 650 Watt |
Corsair |
RM 650 Gold 650 Watt |
- 1 - Introduction, technical data and technology
- 2 - Test setup and methods
- 3 - Teardown: PCB and components
- 4 - Teardown: Cooler and material analysis
- 5 - Gaming-Performance Full-HD (1920 x 1080)
- 6 - Gaming Performance WQHD (2560 x 1440)
- 7 - Details: Power consumption and balancing
- 8 - Transients and PSU recommendation
- 9 - Temperatures, clock rate and thermal imaging
- 10 - Fan curves and noise
- 11 - Summary and conclusion
288 Antworten
Kommentar
Lade neue Kommentare
Mitglied
Mitglied
Urgestein
1
Veteran
Veteran
Urgestein
Veteran
Mitglied
Mitglied
Urgestein
Urgestein
Mitglied
Mitglied
Urgestein
Mitglied
Urgestein
Urgestein
Urgestein
Alle Kommentare lesen unter igor´sLAB Community →