Summary:
The dimms are single rank 16GB based on Micron 16Gb rev.A x8 ICs.
The ICs are temperature sensitive. This isn't really a problem before 1.4V.
5400 38-40-40-70-2T gear2 should work easily at 1.3V
5500 38-44-44-80-2T gear2 should work at around 1.4V
32000 TREFI should be fine with 1.3V.

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