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Yes — these are compatible

Is the Ryzen 7 5800 compatible with B550?

Yes — compatible: Ryzen 7 5800 + B550. Socket AM4 matches. Live eBay prices for both.

✓ Socket compatible

How they line up

Spec
Ryzen 7 5800 Ryzen 7 5800
B550 B550
Socket
AM4
AM4
✓
Peak power
142W
—
Memory
—
DDR4

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Ryzen 7 5800
B550

Common questions

Socket AM4 matches. They share the same CPU socket, so the chip physically fits.