white spots

Can anyone kindly tell me the cause of the white dots that are present at the center of the screen, just below the Google logo?

i have a g2 supernova and my question was that i had a cable that was like a 6 pin and connected to my psu but on the other end it had a 6 pin with a 6+2 pin and i was wondering if i could just use both on my 970 with one wire or if i had to use 2 wires and leave the extra 2 pin out