Max Memory for X51 R3

Does anyone know for sure what is the max memory for X51 R3?

From Alienware X51 R3 System Specifications

Memory DDR4 PC4-17000 Non-ECC only (2133 MHz)
2x 240-Pin DDR4 SDRAM Slots for use with the following configurations:
•8Gb Dual Channel (2x4 Gb DIMMS)
•12 Gb (1x 4Gb + 1x 8Gb)
•16Gb Dual Channel (2x8 Gb DIMMS)
Minimum: 4Gb
Maximum: 16Gb
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From Alienware-x51-r3 reference guide_en-us

Slot Two internally‑accessible DDR4 DIMM socket
Capacities of each slot 4 GB, 8 GB, and 16 GB
Type DDR4 SDRAM (Non‑ECC)
Speed 2133 MHz NOTE: The memory is over‑clocked to 2400 MHz or 2667 MHz
Configurations supported 4 GB, 8 GB, 16 GB, and 32 GB
Minimum 4 GB
Maximum 32 GB