Max RAM for the 7910 is 1TB.  Attaching Spec Sheet and Owner's Manual.  Looks like the RAM you picked may work as long as it's not mixed, as R and LR can't be mixed.  RAM chart is on pg. 51 of Owner's Manual. [IMAGE] [IMAGE]  
Will these work in a Precision T7910? I think the Precision caps out at 2 TB Ram.
Precision T7910? Samsung 128gb PC4-2400U 2S4Rx4 DDR4 ECC Server Memory LRDIMM ?