I have the same card. Your HD 5750 has two DVI ports, one HDMI and one display port adapter. You can choose to run both monitors with each of the DVI ports or the top DVI and one HDMI. Some people will argue on the quality difference of the DVI vs HDMI but honestly I couldn't tell much of a difference with my cheaper monitors.
Thats weird my 5750 only has 1 port of DVI, VGA and HDMI