Power consumption and compliance with standards
The maximum values of a very demanding scene are not the whole truth, because the power consumption of fast cards is actually very resolution-dependent. The RX 6700XT is indeed fast, but it also buys this performance plus a bit at the socket. Nevertheless, it is quite possible to leave it all as it is.
There aren’t really any big secrets when it comes to power consumption, as the maximum is pretty much oriented towards the RX 6800 at the limit. The rest is as expected.
As a special service I also recorded the respective single voltages VDDCR_GFX, VDDCR_SOC and VDDCI_MEM, because these values differ significantly from what e.g. GPU-Z outputs as sensor value. Specifications and real values are always 2 pairs of shoes in reality.
Now let’s look at the load of the motherboard slot, which is specified by the PCI SIG with 5.5 Amps. This results in a maximum power of 66 watts at 12 volts. It can be seen very clearly that this limit is undercut by 2.5 to 2.7 A under full load, even if the maximum power limit is used.
The slightly more detailed curve for Gaming and Torture looks like this, with the long 20 ms intervals still very granular.
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 this card, I would therefore calculate a graphics card load of at least 300 to 350 watts proportionate to the total system power consumption on the secondary side, in order to have sufficient reserves for the worst case scenario. 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:
- 1 - Einführung und Testsystem
- 2 - Teardown, Platinenanalyse und Kühler
- 3 - Gaming Performance Full-HD
- 4 - Gaming Performance WQHD
- 5 - Details: Frames per Second (Curve)
- 6 - Details: Percentiles (Curve)
- 7 - Details: Frame Times (Bar)
- 8 - Details: Frame Times (Curves)
- 9 - Details: Variances (Bar)
- 10 - Leistungsaufnahme und Effizienz der Einzelspiele
- 11 - Leistungsaufnahme: Übersicht & Netzteil-Empfehlung
- 12 - Temperaturen und Infrarot-Tests
- 13 - Geräuschemission / Noise
- 14 - Zusammenfassung. Features und Fazit
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