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 measured TBP (Typical Board Power) as a long term value and average for a stable design of the system is not really helpful. 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 specific card, I would therefore calculate with at least 400 watts proportionate to the total power consumption of the system on the secondary side, in order to have sufficient reserves for the worst case scenario. If you use the 15% power limit to the full, or if you have a more “nervous” power supply, it would be at least 450 watts (better 500 watts) at continuous load and peaks of almost 500 watts to be considered.
Transients as detail graphics in different resolutions during gaming and stress testing
Let’s first look at gaming and the 20-ms intervals, using Control with DXR in UHD as the game here. The spikes are definitely brute, but lower than on the GeForce RTX 3090 FE.
This applies to the same extent, if not more extreme, to the stress test. The appropriate measurements for power and current flow are also available for this purpose:
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. Let’s start with gaming again first and we see the rule frenzy of telemetry again:
In the stress test, on the other hand, the usual picture with the protective mechanisms taking effect can be seen in the small intervals:
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