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 6600XT does quite well within its capabilities, beating both the GeForce RTX 3060 and RTX 3060 Ti at the socket.
There aren’t really any big secrets when it comes to power consumption, as the card once again sets real standards in this performance class with an ample 170 watts. That this could be written about a Radeon would certainly not have been dreamed of two years ago.
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 very significantly under full load with 2.7 to 2.9 A, 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 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 this card, I would therefore calculate a graphics card load of at least 200 to 250 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 - Testsystem und Methodik
- 3 - Teardown, Platinenanalyse und Kühler
- 4 - Gaming Performance Full-HD
- 5 - Gaming Performance WQHD
- 6 - Gaming Performance DXR & FSR vs. DLSS
- 7 - Details: Frames per Second (Curve)
- 8 - Details: Percentiles (Curve)
- 9 - Details: Frame Times (Bar)
- 10 - Details: Frame Times (Curves)
- 11 - Details: Variances (Bar)
- 12 - Leistungsaufnahme und Effizienz der Einzelspiele
- 13 - Leistungsaufnahme: Übersicht & Netzteil-Empfehlung
- 14 - Temperaturen und Infrarot-Tests
- 15 - Geräuschemission / Noise
- 16 - Zusammenfassung. Features und Fazit
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