Crucial 16 Gb not working

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It seems like the Crucial RAM you purchased (CT16G4SFRA32A) is not compatible with your NAS DS423+. This could be due to various reasons such as compatibility issues or faulty hardware. I would recommend reaching out to Crucial's customer support for further assistance. They can provide insights into compatibility and troubleshooting steps to resolve the issue. Additionally, you may want to consider checking the compatibility list for your NAS model to ensure compatibility with RAM modules. If the RAM is indeed incompatible, you might need to return it and look for a compatible alternative.

https://nascompares.com/answer/synology-...tible-ram/