My question is whether any, and if yes how many simultaneously , of the 3 display ports on this card support dual-mode or DP++.
 
Some Info I looked up on dual mode
If the source supports dual-mode DisplayPort (also known as DP++), then you can use a passive adapter because the source can perform the conversion. If the source does not support DP++, then you need to use an active converter, which includes additional chips to perform the conversion.
 
The DisplayPort uses an  signal protocol that is not compatible with DVI or HDMI. However,  DisplayPorts are designed to transmit a  DVI or HDMI protocol () across the interface through the use of an external passive adapter. This adapter enables compatibility mode and converts the signal from 3.3 volts to 5 volts. For analog / and , a powered active adapter is required for compatibility and does not rely on dual mode. Active VGA adapters are powered by the DisplayPort connector directly, while active dual-link DVI adapters typically rely on an external power source such as USB.
 
My card P/N: 08G-P4-2071-KR.  I did some searching and did not find a very official word as to the DP++ support.
 
I know I can be on the safe side and purchase active adapters but if I can save a some money I'd like to know how passive adapters are supported and supported simultaneously.
 
I have one adapter DP to DVI that I'm currently using that I'm fairly confident that is passive, but want to know whether an additional 1 or 2 passive adapters (either DP to DVI or DP to HDMI) could be supported simultaneously.
 
Thanks in advance