Return posting costs will be at your expense. HP Z840 Workstation 2x E5-2673 v3 2.30 GHz, 128GB DDR4 1TB M. HP Z420 Workstation Intel Xeon E5-1650 3.2GHz 64GB RAM 500GB SSD Quadro K4000. We work closely with all 5 major courier companies, so we assure your items will be on time, and delivered with care and extra attention to detail.