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Not compatible

Is the Ryzen 9 7900X compatible with B450?

No — not compatible: Ryzen 9 7900X + B450. Socket mismatch: CPU is AM5, motherboard is AM4. Live eBay prices for both.

How they line up

Spec

Ryzen 9 7900X

Ryzen 9 7900X

B450

B450

Socket

AM5

AM4

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Peak power

230W

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Memory

—

DDR4

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Ryzen 9 7900X

B450

Common questions

Socket mismatch: CPU is AM5, motherboard is AM4. The sockets differ, so the CPU will not fit this board.