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May 22, 2014 2:26 AM in response to Starkim-Wby lllaass,VGA adopters are active.
10. What is the difference between an active adapter and a passive adapter?
An active adapter can convert a signal from one connector to another. The Apple Mini DisplayPort to Dual-Link DVI and Apple Mini DisplayPort to VGA adapters are active adapters. A passive adapter acts as a pass-through from one connector type to another and does not convert a signal. The Apple Mini DisplayPort to DVI adapter is an example of a passive adapter.
http://support.apple.com/kb/HT3382#9
This is not clear with regard to number of active adopters tht can be used
Mac Pro (Late 2013): Using multiple displays
It implies that you could have six VGA mointors
However, the fillowing discusses that the Maverick 10.9.3 update cause their thrd monitor not to work
10.9.3 kills third monitor: Apple Support Communities
I still have three monitors (all 100p or less) on mine:
- One HDMI
- One mini display port to display port
- One mini display port to VGA