. Single or Dual Processor Up to Twelve (12) Core Xeon · 16 Memory Slots Up to GB DDR3 RAM · Up to 2x Graphics Cards Up to W Power Supply. Disconnect the power and all other peripherals. 1 PCI Express Gen3 x4 slot. 1 PCI Express Gen3 x8 slot - with x16 connector. I/O slots (see system board section for more details). 2 channels of Serial. Insert the graphics card in slot Insert the Matrox video board in slot Insert the radial-. hp z hard drive configuration. The Z Workstation offers one of the industry's best chassis, enabling you to perform service and modifications with incredible ease with features such as. Slot 1, PCIe x8 mechanical, x4 electrical, Half length slot reserved for third party cards* ; Slot 2, PCIe x16 (Graphics), NVIDIA graphics card . 3 PCI Express Gen3 x16 slots. If your Z is configured with any of the new generation V2 CPU choices then both NIC ports can be used for ISIS / connectivity. -. In addition to the PCIe3 I/O provided by the E processors, the HP Z has 1 PCIe Gen2 x4 slot and 1 Legacy PCI (bit/33 MHz) slot.