Your Mac Pro can have up to 1.5TB of memory, and it’s easy to install yourself. Be sure to read the documentation to be sure you’re installing your DIMMs in the correct slots. If your DIMMs are in the wrong slots, you’ll be notified by macOS.
Contact Apple Support for Mac: http://apple.co/Mac
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To download the Apple Support app: http://apple.co/2hFtzIv
Apple Support on Twitter: https://twitter.com/AppleSupport