Load peaks (transients) and power supply recommendation
As I have already proved in detail in my basic article “The battle of graphics card against power supply – power consumption and load peaks demystified”, there are also higher loads in the millisecond range, which can lead to unexplainable shutdowns in the case of unfavorably designed or improperly equipped power supplies. The TBP (Typical Board Power) measured by the graphics card manufacturer or the reviewers alone does not really help in this case for a stable system design. Peaks with intervals between 1 and 10 ms can lead to shutdowns in very fast reacting protective circuits (OPP, OCP), especially in multi-rail power supplies, although the average power consumption is still within the standard.
For the Radeon RX 6900 XT, I would therefore calculate at least 420 watts for the normal OC with up to 350 watts as the power limit for the graphics card load as a proportion of the total secondary power consumption of the system in order to have enough reserves for the worst case scenario.
Transients as detailed graphics in different resolutions during gaming and stress testing
A short excerpt with higher resolution shows us now the 20 ms measurements (10 μS intervals), as I let them run automatically for value determination:
- 1 - Introduction, Data and Test Setup
- 2 - Teardown: PCB, Power Scheme and Cooler
- 3 - Borderlands 3
- 4 - Control (+DXR)
- 5 - Far Cry New Dawn
- 6 - Ghost Recon Breakpoint
- 7 - Horizon Zero Dawn
- 8 - Metro Exodus (+DXR)
- 9 - Shadow of the Tomb Raider
- 10 - Watch Dog Legion (+DXR)
- 11 - Wolfenstein Youngblood
- 12 - World War Z
- 13 - Power Consumption and Efficiency in Gaming
- 14 - Power Consumption in Detail, Voltages and Standards
- 15 - Transients and PSU Recommendation
- 16 - Clock Rate and Temperatures
- 17 - Fan Curve and Noise
- 18 - Summary and Conclusion
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