I'm planning to get a 1440p monitor and i'd like to get a second video card to make up for the performance loss. But my psu is an antec hcg 620m and i'm not sure if it's enough. My current asus 670 is oc to 1125/6500 and i'd probably go for a similar oc on the second if possible. My cpu is an i5-3570k which i will oc later when it starts to get slow.