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Correct.


MTA18ADF2G72AZ-3G2 is unbuffered (VLP UDIMM) as classified by Micron here: https://www.micron.com/products/dram-modules/vlp-udimm/part-catalog/mta18adf2g72az-3g2


MTA18ADF2G72PZ-3G2 is registered (VLP RDIMM) as seen here: https://www.micron.com/products/dram-modules/vlp-rdimm/part-catalog/mta18adf2g72pz-3g2