A:Answer the GTX 645 "oem" gpu that comes with you pc, might not be enough to push two monitors that size, definitely upgrade the card
http://www.bestbuy.com/site/xfx-amd-radeon-r7-360-2gb-gddr5-pci-express-3-0-graphics-card-black-gray/8278084.p?id=1219690432818&skuId=8278084
this card will work, but make sure your psu is at-least 500wt