5 outputs, but only 4 works - multi-monitor

is someone able to tell me why i have 5 outputs, but only 4 works with multi-monitor

I remember i tested it, and when i plugged 1 in, the other monitor stopped working,

in short, i can only have a max of 4 displays, and not 5

what is the 5th output for?


i have a gtx 970,
evga970ssc-8b.jpg


seems like a waste, what can i use it for
 
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