Tech Specs 

Processor:  1 processor from the following product families:
Intel® Xeon® processor E3-1225 v5
Operating System
Microsoft® Windows Server® 2012
Microsoft Windows Server 2012 R2
Red Hat® Enterprise Linux®
Ubuntu 14.04 / 16.04
Availability
Error Correction Code (ECC) memory 
Software RAID
Chassis
Mini tower
Chipset
Intel C236
Dimensions
Height: 14.17 inch / 359.9mm
Width : 6.89 inch / 175mm
Depth : 17.12 inch / 434.85mm
Memory
Architecture: 4 DIMM slots
Maximum RAM: up to 64GB DDR4 2133MT/s
Management
Intel AMT 11.0 (supported on Intel Xeon config)
Intel Standard Manageability.
Network Controller
Intel I219-LM Gigabit Ethernet LAN 10/100/1000 1-port
Ports
10x USB, 1 microphone, 1x headphone, PS2, Displayport, HDMI, RJ45, serial, audio in, audio out
Power
290W
RAID Controllers
Software RAID: Intel Rapid Storage Controller 12.0 (supports SATA 6Gb/s or SATA 3Gb/s)
Regulatory
Product Safety, EMC and Environmental Datasheets
Dell Regulatory Compliance Home Page
Dell and the Environment
Slots
4 slots:
1 PCIe x16 3.0 
1 PCIe x16 3.0 (x4 speed) 
1 PCIe x4 3.0
1 PCI
Storage
Up to 6 total SATA HDDs (4 x 3.5” SATA HDD + 2 additional 2.5” SATA HDD (w/ expansion kit and optional controller card)
Optical bay: Internal DVD+/-RW (standard on Intel Xeon configuration)