| Model | HP Z4 G4 Workstation |
| Operating System | Windows 10 Pro for Workstations1 |
| HP Installer Kit for Linux® | |
| Red Hat® Enterprise Linux® | |
| Processor Family | Intel® Xeon® W processor |
| Chipset | Intel® C422 |
| Maximum Memory | Up to 256 GB DDR4-2666 ECC SDRAM8 Standard memory note: Transfer rates up to 2666 MT/s. |
| Memory Slots | 8 DIMM |
| Drive Controllers | Integrated SATA 6.0 Gb/s; Factory integrated RAID available for SATA/SAS drives (RAID 0, 0 Data, 1, 5, and 10) |
| Internal Storage | up to 300 GB SAS (15000 rpm)4 |
| 500 GB up to 2 TB SATA (7200 rpm)4 | |
| up to 500 GB SATA SED (7200 rpm)4 | |
| 1 TB up to 4 TB 7200 rpm SATA Enterprise4 | |
| 256 GB up to 2 TB SATA SSD4 | |
| 256 GB up to 512 GB SATA SED Opal 2 SSD4 | |
| 240 GB up to 480 GB SATA Enterprise SSD4 | |
| Optical Storage | HP Slim DVD-ROM; HP Slim Blu-ray Writer; HP Slim DVD-Writer5,6 |
| Additional Storage | HP SD 4 Media Card Reader (optional) |
| Expansion Slots | 2 PCIe 3 x4; 2 M.2 PCIe 3 x4; 1 PCIe x8; 2 PCIe x16 |
| Slots 2 and 4: PCH with open-ended connector. Slot 5: CPU with open-ended connector. M.2 Slots: CPU up to 80 mm storage devices | |
| Audio | Integrated Realtek HD ALC221 |
| Power | 465 W internal power supply, up to 90% efficiency, active PFC; 750 W internal power supply, up to 90% efficiency, active PFC |
| Input Device | HP PS/2 Business Slim Keyboard; HP USB Business Slim Keyboard; USB Premium wired keyboard; USB Smart Card (CCID)keyboard10 |
| 3Dconnexion CADMouse; HP USB Optical Mouse; HP PS/2 Mouse; HP USB Hardened Mouse10 | |
| Security | HP Sure Start Gen3; Secure authentication; Kensington lock slot; Full volume encryption; HP Keyed Cable Lock Kit; TPM 2.0 certified; |
| HP Secure Erase14,15,18 | |
| Software | HP Remote Graphics Software (RGS); HP Performance Advisor13 |
| Dimensions | 38.6 x 16.9 x 44.5 cm |
| Weight | Starting at 10.2 kg Exact weight depends on configuration. |