맥의 각종 젠더, 컨버터의 active passive 여부 for 모니터 연결

from https://support.apple.com/en-us/HT204149

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.

11. Should I use a passive or active adapter?

On some Apple computers, like the Mac Pro (Mid 2010), you can connect three displays to a single graphics card. In this scenario—to connect to three display to use three ports—use active adapters to connect the Mini DisplayPort ports to your external displays. Two displays can connect via Mini DisplayPort and one via DVI. Note: Learn more about supported display configurations for the Mac Pro.