Mounting and organizing options for heavy duty Mac Pro users continue to grow since the new machine's launch at the end of last year, with Sonnet now announcing a new rack mount enclosure capable of holding two Mac Pros. The new enclosure is an additional option to go along with the enclosure and expansion chassis the company announced last week. This time, the Sonnet Rack Mac Pro allows users to rack mount one or two Mac Pro machines in a 4U space. The unit includes a front panel power button with USB 3.0 port for each machine, plus a second USB 3.0 port, a Gigabit Ethernet port, and an HDMI connector on the back of the rack for each Mac Pro. There are no rear Thunderbolt ports because, Sonnet says, there are no panel-mount Thunderbolt connectors available.