Processor: Intel Xeon E5-1620 (4 cores, 8 threads, 3.6 GHz base clock, 3.8 GHz turbo boost)
Memory: 16 GB DDR3 ECC RAM (1600 MHz, 4 x 4 GB DIMMs)
Storage: 500 GB SATA 7200 rpm hard drive
Graphics: NVIDIA Quadro K620 (2 GB DDR3, 384 CUDA cores)
Operating System: Windows 7 Pro 64-bit
Optical Drive: DVD+/-RW drive
Networking: Integrated Intel Ethernet LAN 10/100/1000
Ports: 2 USB 3.0 ports (front), 8 USB 2.0 ports (4 front, 4 rear), 1 audio line-in/microphone (front), 1 audio line-out (front), 1 headphone jack (front), 2 PS/2 ports (rear), 1 RJ-45 port, 1 serial port (rear), 1 parallel port (rear), 1 IEEE 1394a (rear)
Power Supply: 600W 90% efficient (80 PLUS Gold) power supply
Dimensions: 17.5" x 6.7" x 17.0" (H x W x D)
Weight: Starting at 24.3 lbs
This configuration is customizable, so you may adjust some of the components or add more to it based on your specific needs and budget. Note that the HP Z420 supports up to 128 GB of DDR3 ECC RAM and multiple storage drives, including SATA, SAS, and PCIe SSDs, so you may choose the appropriate options based on your workflow and budget. Additionally, you may upgrade the graphics card to a higher-end NVIDIA Quadro or AMD Radeon Pro card to improve the performance in 3D modeling, animation, or rendering applications.