HP Z2 TWR Dual Front Fan Kit (4N007AA) 

HP Z4 G4 Fan and Front Card Guide Kit (1XM33AA)

HP Z4 G4 Memory Cooling Solution (1XM34AA)

HP Z4 G5 Fan and Front Card Guide Kit (57K40AV)

• HP Z4 TWR Base Unit G5 IDS
  
• HP Linux-ready
• Operating System Load to M.2
• Intel Xeon W3-2423 2.1G 15MB 6 cores 120W CPU
  
• Chipset: Intel W790
• 16GB (1x 16GB) DDR5 4800 DIMM ECC REG Memory
• NVIDIA T400 Graphics (4GB GDDR6, 3 x Mini DisplayPort 1.4, PCIe x16) 
• 512 GB M.2 PCIe NVMe SSD 
• Integrated: Intel I219-LM PCIe GbE
• Slots: 1 PCIe 5 x16; 2 PCIe 4 x16; 2 PCIe 4 x4
• HP USB 320K Keyboard
• HP Wired 320M Mouse
• 1125W EPA90 WW Power Supply
• Warranty: 3 Years 

• HP Z4 TWR Base Unit G5 IDS
  
• HP Linux-ready
• Operating System Load to M.2
• Intel Xeon W3-2425 3.0G 15MB 6 cores 130W CPU
  
• Chipset: Intel W790
• 32GB (2x 16GB) DDR5 4800 DIMM ECC REG Memory
• NVIDIA RTX A1000 ( 8GB GDDR6, 4 x Mini DisplayPort) Graphics
• 512 GB M.2 2280 PCIe NVMe SSD
• Integrated: Intel I219-LM PCIe GbE
• Slots: 1 PCIe 5 x16; 2 PCIe 4 x16; 2 PCIe 4 x4
• HP USB 320K Keyboard
• HP Wired 320M Mouse
• 1125W EPA90 WW Power Supply
• Warranty: 3 Years