1 PCI Express Gen3 x4 slot. Insert the graphics card in slot Insert the Matrox video board in slot Insert the radial-. . 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. Disconnect the power and all other peripherals. -. 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. 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. hp z hard drive configuration. 3 PCI Express Gen3 x16 slots. I/O slots (see system board section for more details). Slot 1, PCIe x8 mechanical, x4 electrical, Half length slot reserved for third party cards* ; Slot 2, PCIe x16 (Graphics), NVIDIA graphics card . 1 PCI Express Gen3 x8 slot - with x16 connector. If your Z is configured with any of the new generation V2 CPU choices then both NIC ports can be used for ISIS / connectivity. 2 channels of Serial.