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I have a Mac Pro 5,1 running 10.7.5.

Do any of the USB ports support USB 3? Or do I need to buy a card?

  • By support do you mean the software will work with a specific PCI card or that the hardware is included with the Machine as shipped by Apple? – bmike Jan 6 '14 at 20:51
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No the first Mac Pro with a USB 3 port is the latest (6.1, late 2013)

From the specifications for your particular Mac Pro:

Connections and audio

  • Four FireWire 800 ports (two on front panel, two on back panel)
  • Five USB 2.0 ports (two on front panel, three on back panel)
  • Two USB 2.0 ports on included keyboard
  • Front-panel headphone minijack and internal speaker
  • Optical digital audio input and output TOSLINK ports
  • Analog stereo line-level input and output minijacks
  • Multichannel audio through Mini DisplayPort

A quick Google search shows several PCI Express USB 3.0 cards, e.g.,

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I know this is a bit late, but the Inateck cards using the FL1100 chipset from FRESCO work great because that's the same chipset used in later Mac Pros. Here is a guide to installing these cards

How to add USB 3 to a Mac Pro for under 25 quid

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