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 with very fast reacting protection circuits (OPP, OCP), especially with multi-rail power supplies, although the average power consumption is still within the norm.
For the peaks of the card, I would calculate with at least 420 to 430 watts proportionate to the total power consumption of the system on the secondary side, in order to have enough reserves just in case. If the 330 Watt power limit is used to the full, peaks of at least 450 Watt would be in the relevant range.
Transients as detail graphics in different resolutions during gaming and stress testing
A short excerpt with higher resolution now shows us the even higher resolution 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 and Technical Details
- 2 - Test System and Methods
- 3 - Teardown: PCB and Cooler
- 4 - Gaming Performance
- 5 - Efficiency and Power Draw in Gaming
- 6 - Power Consumption and PCI SIG Standrad
- 7 - Transients and PSU Recommendation
- 8 - Clock Rate and Temperatures
- 9 - Fan Speed and Noise (Audio samples included)
- 10 - Summary and Conclusion
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