What type of CPU does the Synology DS423 use, and is the 2GB RAM upgradable for enhanced performance?

The Synology DS423 uses a Realtek processor. The product information does not specify whether the 2GB RAM is upgradable.

Is the Synology DS423 4-Bay NAS compatible with both Windows and macOS systems for file sharing and access?

Yes, the Synology DS423 supports file sharing and access through SMB and AFP protocols, which are compatible with both Windows and macOS systems.

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Synology DS423 4-Bay NAS, 2GB RAM, 32TB (4 x 8TB) of Synology Plus NAS Drives Fully Assembled and Tested By CustomTechSales