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Not compatible
Is the Ryzen 9 7900X compatible with A520?
No — not compatible: Ryzen 9 7900X + A520. Socket mismatch: CPU is AM5, motherboard is AM4. Live eBay prices for both.
How they line up
Spec
Ryzen 9 7900X
A520Socket
AM5
AM4
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Peak power
230W
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Memory
—
DDR4
Live prices
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Common questions
Socket mismatch: CPU is AM5, motherboard is AM4. The sockets differ, so the CPU will not fit this board.