Compatible Upgrade for: MacPro7,1 - A1991 - EMC 3203     16 Core 3.5GHz  2019 
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Standard Memory: 32 GB 2933MHz 
Maximum Memory 1 TB
Note:

This system has twelve (12) user-accessible memory slots.
This model uses 288-pin PC23400 DDR4 RDIMM or LRDIMM memory modules (but you cannot mix RDIMMs and LRDIMMs in the same system).

The following items are also compatible with this product...............................
External Hard Drives Battery SSD Graphics Cards

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