The "be quiet Straight Power 11 Gold 850 W" power supply should be sufficient for the Sapphire Nitro+ Radeon RX 7900 XTX Vapor-X (24 GB).

Here are some relevant details on the graphics card's power consumption:
- The Sapphire Nitro+ Radeon RX 7900 XTX Vapor-X has a power limit of 420 watts.
- The recommendation for the entire system is often a total power consumption that takes into account the graphics card, CPU and other components. An 850 watt power supply unit offers sufficient reserve to cover the system's requirements.

However, it is always advisable to calculate the total power of all components in the system to ensure that the power supply is sufficient.

Go for a minimum 1000w. This card has strange power peaks of up to 470 - 500. It’s always better to have a good margin of power

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