Power consumption in factory state as summary
The around 8 watts in idle are good, you can leave it like that. With a second monitor and a different resolution or 144 Hz refresh rate, it quickly becomes a few watts more (sometimes even over 30). By the way, we can see very well that the full TBP of 165 watts is almost always exhausted. It’s hardly less than 160 watts in a normal 3D case.
Load distribution between PCIe slot and PCIe sockets
AMD uses the PCIe slot a bit, especially when gaming. But you are at about half of what is allowed with 5.5 amps maximum for the flowing currents, even with a slightly increased power limit.
While NVIDIA has significantly reduced the supply via the PEG, AMD still uses this rail quite excessively, even on the 3 volt rail.
Rough 20-ms intervals
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 power supplies’ supervisor chip (shutdown). We see that even short load peaks are capped at 18 A at the latest. but a real limitation looks different.
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 in 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 over 270 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.
The torture test is hardly any different.
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 from all manufacturers and can hardly be avoided.
- 1 - Introduction, technical data and technology
- 2 - Test system and igor'sLAB MIFCOM-PC
- 3 - Teardown: PCB, compnents and 8-Pin issues
- 4 - Teardown: Cooler and thermal grease
- 5 - Gaming performance Full-HD (1920 x 1080)
- 6 - Gaming performance WQHD (2560 x 1440)
- 7 - Latencies, DLSS vs. FSR
- 8 - Details: Power consumption and load balancing
- 9 - Transients, capping and PSU recommendation
- 10 - Temperatures, clock rate and thermal imaging
- 11 - Fan curves, noise and sound sample
- 12 - Summary and conclusion
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