I know in the past I've had to use active adapters when I'm dealing with a graphics card with DVI-I/DVI-D ports to get them to work with old VGA monitors.
I'm wanting to know if when I'm buying an adapter for my graphics card's DisplayPort to VGA.
Can I just buy any old adapter, to convert DisplayPort to VGA, or do I need an active one (if they exist)?
Answer
Display port to VGA does require an active adapter, however it will get power from the port itself and does not require external power.
Further reading: here
Analog VGA and dual-link DVI require powered active adapters to convert the protocol and signal levels and do not rely on Dual-Mode. VGA adapters are powered by the DisplayPort connector, while dual-link DVI adapters may rely on an external power source (see Dual-mode).
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