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It requires an LGA1151 300 series MB. Even with the 300 series chipset, there may be compatibility issues with 9 gen cpus. You will have to look at compatibility of your MB model on the Intel website. If your MB is not 300 series, you need a 7 gen cpu.
Sorry, there was a problem. Please try again later.Yes, i5-9400 CPU fits in LGA1151 Socket.
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