Do you mean the GV-N960OC-4GD? If so, then yes, it should fit. Gigabyte's web page says the card is 177 mm long. PCPartPicker says it's 181 mm. But either way it should be okay, because LC-Power's web site says the case can accommodate a card up to 260 mm:
http://www.lc-power.com/en/product/gehaeuse/atx-pro-line/pro-925b/
ETA: Checked the width too, just to be safe...the case is 180 mm wide and the card is 121 mm, so that should also work.