If you want to connect a graphic card with DisplayPort Female to a monitor by using a DVI cable, you need this DisplayPort to DVI adapter
Connectors: DisplayPort Male, DVI Female
Remark: The DisplayPort-DVI adapter is only working in one direction: the DisplayPort plug has to be connected to the source device (e.g. graphic card)

Side A connection (PC)	 	DisplayPort
Side B connection (Peripherals)	 	DVI F
Left Connector Type	 	DisplayPort
Left Connector Gender	 	Male
Right Connector Type	 	DVI-D 24+1, Dual-Link
Right Connector Gender	 	Female
Colour (Cable)	 	black
Area of application	 	External
Dimensions (HxWxD)	 	14 x 44 x 44 mm
Length	 	0.15 m