Standard compliance
Let’s now look at the load of the motherboard slot, which is specified by the PCI SIG as 5.5 amps. This results in a maximum power of 66 watts at 12 volts. You can see very clearly that this limit is undershot by all cards, even if you use the maximum power limit. MSI has done a good job here and the slot stays nice and cool.
Transients and power supply recommendation
As I have already demonstrated in detail in my basic article “Graphics Card’s Battle against Power Supply – Power Consumption and Peak Power Demystified”, higher loads in the millisecond range do exist for short periods of time, which can lead to inexplicable shutdowns if the power supply units are not properly designed or equipped. The TBP (Typical Board Power) measured by the graphics card manufacturer or the reviewers is not really helpful for a stable system design. Peaks with intervals between 1 and 10 ms can lead to shutdowns in very fast-response protection circuits (OPP, OCP), especially in multi-rail power supplies, although the average power consumption is still within the norm.
For the RX 6950 XT, I would therefore calculate 500 to 550 watts as a graphics card load proportionate to the system’s total secondary-side power consumption in order to have enough reserves for the worst case scenario.
For the RX 6750 XT, I would therefore calculate 400 to 450 watts as the graphics card load proportionate to the system’s total power consumption on the secondary side in order to have enough reserves for the worst case scenario.
For the RX 6650 XT, I would therefore calculate a graphics card load of 300 to 350 watts proportionate to the system’s total power consumption on the secondary side in order to have enough reserves for the worst case scenario.
A short excerpt with higher resolution now shows us the individual 20-ms measurements for each of the three cards (10 μS intervals), as I run them automatically to determine the value:
- 1 - Intro, Unboxing, Specs and Test System
- 2 - Gaming Performance Full-HD (1920 x 1080 Pixels)
- 3 - Gaming Performance WQHD (2560 x 1440 Pixels)
- 4 - Gaming Performance Ultra-HD (3840 x 2160 Pixels)
- 5 - FPS-Curves and Percentiles
- 6 - Frame Times and Variances
- 7 - Gaming: Power Consumption CPU, GPU and Efficiency
- 8 - Power Consumption in Applications and Details
- 9 - Standards, Transients and PSU Recommendation
- 10 - Temperatures and Thermal Imaging
- 11 - Fand Speed and Noise
- 12 - Summary and Conclusion
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