I guess that is why AMD minimum recommended PSU wattage for the RX6900XT is 850 Watts to account for those high wattage pulses.
From the article link which I translated into English recommends the following:
Error and omission correction: In the 6800XT/6800 power consumption test chart, the average maximum power consumption of the 6800XT is 354W, which is actually the average maximum power consumption of +15% PowerLimit. In order to deal with the feature that the NV built-in driver cannot be overclocked, the default non-unlock power consumption is unified this time Status data.
2. The peak power consumption of 6900XT is 810W/80μs when the power consumption limit is not unlocked , and the average maximum power consumption is 307W. After unlocking, the peak power consumption is 883W/90μs and the average maximum power consumption is 357W. Does not exceed PCIE electrical specifications.
3. In the test, it can be seen that the power consumption of the 6900XT platform is close to 700W. After unlocking the PowerLimit, the peak value can run close to 900W. For a 750W power supply, 120% of the rated power is required to meet the 900W demand of the graphics card.
The above has not considered the power consumption of the CPU and other accessories. With a mid-to-high-end CPU, the power consumption is properly 1000W, and with a high-end CPU, the power consumption is often close to 1200W. Therefore, it is recommended to start with 6900XT with a power supply of 850W. For overclocking and using high-end CPUs, please increase your power budget. It is better to choose a power supply of 1000W and above . After all, you have reached the flagship graphics card. For performance, there are fewer power consumption restrictions.
4. This generation of 7nm and 8nm process showdowns. Both the duration and amplitude of peak power consumption of A card are lower than that of N card. N card users suggest to increase the budget for power supply and heat dissipation.
5. In the case of non-public graphics cards, if the non-public version is overclocked or the power supply has shrunk, you need to increase the power budget.
6. Update the power supply recommendation table 1.6. It is recommended but not mandatory. Some collocations will take time to verify. The choice of actual graphics card requires comprehensive performance, power consumption, price, supply and other factors. This article only discusses power consumption and power requirements.
NOTE: I have no way of knowing how accurate or official this foreign made review of Power Consumption is.
I image only a AMD Engineer will be able to answer if the above article is close to being accurate.
