Power consumption in factory settings as a summary
The approximately 19 watts in idle have improved, but are still quite high, fluctuating between 10 watts and up to 28 watts. With a second monitor, this quickly becomes 34 watts and more (peaks over 48 watts). The driver still needs to be improved here. Incidentally, we can see very clearly that the full TBP is utilized from QHD and even the Torture Loop barely increases and remains well below 280 watts. AMD’s new implementation of telemetry for the entire card has a very limiting effect here. Unfortunately, it is no longer possible or allowed to intervene significantly. In both directions, by the way, because undervolting is now obsolete.
Load distribution between the PCIe slot and the PCIe sockets
The distribution of the power supply shows that the card still has reserves in terms of TBP and the performance of the rails. While the two 8-pin connectors are not fully utilized, the motherboard slot is also well in the running with up to 2.1 amps. So there is still room for an OC, but do you want to or can you?
All in all, AMD has solved the load distribution quite well here and I have the link to the basic article on AMD’s new telemetry for anyone who is curious:
Load peaks and capping
Let’s first take a look at the flowing currents. Measurements were taken in coarse 20 ms intervals, i.e. around 50 times per second, to simulate the load on the supervisor chip of the power supply units (shutdown). We can see that ALL load peaks are capped at 37 A at the latest, which is just fine. The RX 7900XT from AMD generated similar peaks of up to 39 amps in places!
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 three different power supply connections here, even though all three connections meet again somehow on the graphics card’s circuit board. What we can now see here as much clearer fluctuations and peaks is due to the power supply unit overvolting a little in places and therefore to the voltage and not the currents. This is due to technical reasons, but is not a problem. However, we can also see that the few peaks up to and above 460 watts are not only caused by the flowing current (graphics card), but actually result from the power supply!
The Torture test is hardly any different, even if you can see the lower peak values and, above all, the drops. The average, on the other hand, actually rises slightly.
If you now add the voltage to the equation, you can see a stronger ripple, which in turn results from the somewhat jittery operating voltage. However, to the power supply’s credit, it must also 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 break the whole thing down even higher and take 20 ms as the total runtime. The intervals of 10 microseconds can still be measured reasonably and we can also see the voltage here as a gray curve, the average value of which is just over 12 volts, but which nevertheless still alternates a little within the permissible range.
If you then convert this to the power consumption in watts, you get this picture:
I did the whole thing again for the Torture Loop, where we can admire the regular drops. First of all, the currents again, but with lots of strange, sporadically recurring drops in each rise. It looks like a violent hiccup before the power is really throttled back shortly afterwards.
And then the total wattage again:
Power supply recommendation
Now we come to the point that makes a complete mockery of the expected sensation of exploding power supply units. Even IF the card is hopelessly overpowered, nobody actually needs ATX 3.0 power supplies over 1000 watts for such cards, unless the CPU consumes more than 400 watts. This is really a pure job creation measure for the starving power supply industry and only satisfies the sick imagination of some standardization fetishists. You really have to put it that harshly. So you should always stay below 600 to 700 watts, even together with the CPU, if you count up to 10 ms. Because that’s what the power supply units still “see”
With this in mind, I also formulate my power supply recommendation for the Sapphire Radeon RX 7900 GRE Pure 16GB as follows: you should be able to get by quite safely with a modern 650-watt gold or platinum power supply. If you want to overclock, you should plan another 50 watts more, which is especially true for the board partner cards.
- 1 - Introduction, technical data and technology
- 2 - Test setup and methods
- 3 - Teardown: PCB and components
- 4 - Teardown: cooler and backplate
- 5 - Teardown: material analysis
- 6 - Gaming performance Full-HD (1920 x 1080)
- 7 - Gaming performance WQHD (2560 x 1440)
- 8 - Gaming performance Ultra-HD (3840 x 2160)
- 9 - Gaming performance DLSS / FSR (3840 x 2160)
- 10 - Power consumption, transients and PSU recommendation
- 11 - Tmepratures, clock rates and infrared
- 12 - fan speed, noise and audio-sample
- 13 - Summary and conclusion
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