Load peaks (transients) and power supply recommendation
As I have already demonstrated in detail in my basic article “The battle of graphics card versus power supply – power consumption and load peaks demystified”, higher loads in the millisecond range do exist for short periods of time, which can already lead to inexplicable shutdowns in the case of poorly designed or improperly equipped power supplies. 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 reacting protection circuits (OPP, OCP), especially in multi-rail power supplies, although the average power consumption is still within the norm.
For the card, I would calculate with at least 400 watts proportionate to the total power consumption of the system on the secondary side, in order to have enough reserves for the worst case scenario. If the 15% power limit is fully utilized, it would be 400 watts continuous load and 450 watts peaks to be considered.
Transients as detail graphics in different resolutions during gaming and stress testing
Now let’s compare the detailed graphics with the many spikes:
This applies to the same extent, if not more extreme, to the stress test. There are also suitable measurements for this:
A short excerpt with higher resolution now shows us the 20-ms measurements (10 μS intervals), as I run them automatically to determine the value. First, let’s start with gaming again:
During the stress test, the downregulation of the telemetry is clearly visible in the small intervals.
- 1 - Introduction, Unboxing and Technical Data
- 2 - Teardown: PCB, Power Supply and Cooler
- 3 - Gaming Performance
- 4 - Gaming Power Draw and Efficiency
- 5 - Power Consumption, Voltages and Standards
- 6 - Transients and PSU Recommendation
- 7 - Clock Rate, OC and Temperatures
- 8 - Fan Speed and Noise
- 9 - Conclusion and Final Words
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