You are experiencing graphic anomalies called artifacts. They happen when you have a defective, overheated, or card that is overclocked to high. If you still have the warranty I do advise you take care of this as soon as you can but that is what you are dealing with. I have had a card that has done this and my computer got to a point with that card that I couldn't boot it just gave me the finger.
Thank you, i needed this confirmation