Jeff,
Samsung do 32GB LRDIMMs at 1600 Mbps, 1333 Mbps, and 1066 Mbps at both 1.35v and 1.5v. But from what I gather the HP Z820 can only support 1333 Mbps (Maybe you can ask you HP guy(s) about this as well?): Samsung DDR3 LRDIMM
Many thanks in advance,


