Guide to the Commonly Used Monitor Display Ports

Display port - Encyclopedia display port slot In general, the port priority is as follows: DVI; HDMI; Display Port ; DisplayPort ; DisplayPort GTX 900 Series displayport slot DP Port Support Channel HD audio on HDMI YesTrue HD and Dual-slotWidth Thermal and Power Specs: 97 CMaximum GPU Tempurature

display slot Perhaps your 2nd monitor has a DVI or displayport connection? There are also adapter cables that let you connect a graphics card's display port