HP - Power cable - 8 pin PCIe power to 6 pin PCIe power - 8.9 cm - for Workstation Z420, Z440, Z620, Z640, Z820, Z840

Use the 6-pin to 8-pin graphics power adapter to convert the workstation's 6-pin power cable connector to a single 8-pin power connector, which can then be used to power high-power graphics cards or other PCIe cards (sold separately) that require an 8-pin power connector input.