Processor:
Supports Intel Xeon E5-1600 v3/v4 and E5-2600 v3/v4 series.
Options range from 4 to 22 cores, with Hyper-Threading support.
Example: Intel Xeon E5-2667 v4 — 8 cores, 16 threads, 3.2 GHz base clock, 3.6 GHz turbo, 25MB cache.

Memory:
Up to 256GB DDR4 ECC memory at 2400 MHz.
8 DIMM slots total.
(Source: ServerBasket)

Storage:
Supports multiple drives:
Up to 16TB HDD.
Up to 4TB SSD.
HP Z Turbo Drive (PCIe SSD).

Graphics:
Compatible with professional GPUs, including:
NVIDIA Quadro K4200 (4GB GDDR5)
Quadro M4000 (8GB)
Quadro P2000 (5GB)

Ports:
USB: 2 × USB 2.0, 8 × USB 3.0.
2 × PS/2 ports, 1 × RJ-45 Ethernet.
PCIe slots: 2 × x16, 1 × x8, 1 × x4, 1 × x1.
RAID support: 0, 1, 10.

Power Supply:
Two options: 525W (85% efficiency) or 700W (90% efficiency).