The Sonnet xMac Pro Server Expansion System - Thunderbolt 2 4U addresses the "trashcan" Mac Pro's lack of rackmount and expandibility including PCIe slots and drive bays.

Features:

• Provides PCIe Card Expansion for Mac Pro: Use high-performance PCIe cards with your new Mac Pro
• Makes Your Mac Pro Road-Ready: 4U rackmount enclosure securely holds the computer and PCIe cards in place, adding mobility to your Mac
• Three PCIe Slots: Supports three full-length, full-height, single-width cards, or one double-width card plus one single-width card
• Thunderbolt 2 Interface: Maximum performance with Mac Pro, backward compatible with devices equipped with 10Gbps Thunderbolt technology
• Power for High Performance PCIe Cards: Integrated 300W power supply provides plenty of power for any cards you install; 75W auxiliary PCIe power connector enables use of power hungry cards such as the Avid Pro Tools|HDX or the RED ROCKET-X
• Provides Space for Installing Additional Devices: Using optional Mobile Rack Device Mounting Kits, you can install HDDs, SSDs, a tape or optical drive, and more inside the xMac Pro Server's enclosure
• Remarkably Quiet: Temperature-controlled, variable-speed fans automatically and quietly cool the cards
• Front Panel Operation, Rear Panel Connectivity: Front panel power button activates power switch on Mac Pro; USB 3.0 port enables connection of keyboard, mouse, thumb drive, etc.; two Gigabit Ethernet, three USB 3.0, and HDMI ports are mounted at the rear of the chassis for easy connectivity
• Energy Efficient: Variable-speed fans automatically adjust to the unique needs of each configuration, and the auto power on/off feature ensures there is no energy wasted with cards powered on when the Mac Pro is sleeping or off
• Supports Thunderbolt Expansion: Enables daisy chain connection of additional Thunderbolt technology devices when other Mac Pro Thunderbolt ports are in use
• Every Thunderbolt-Compatible Card Supported: Works with every Thunderbolt-compatible PCIe card, regardless of length or height

Specifications:

• Dimensions (WxDxH): 19 x 16 x 7 in. (48.3 x 40.6 x 17.8 cm)
• Weight: 32.5 lbs (14.7 kg)
• Compatibility: Mac Pro (Late 2013), OS X 10.9.2+, OS X Server and OS X Mavericks

In the Box:

• xMac Pro Server, assembled
• Two power cords

Please Note:

• Mac Pro, PCIe cards, and Mobile Rack Device Mounting Kits sold separately
• Thunderbolt cable lock compatible with Apple and Sonnet Thunderbolt cables
• Not compatible with optical Thunderbolt cables