I feel your pain - I've had this problem across several cards and whilst increased cooling has reduced the occurance of the issue, over time it tends to creep back and cause issues again.
The stretched polygons you can see are called artifacts, and what is causing this artificing is corrupt memory. The memory is corrupt due to overheating as people have mentioned. Many graphics cards today are being absolutely hammered by more and more demanding games, and as a result, the physical memory on these cards are cookin' because by the large they are left uncooled by the manufacturers.
You can buy memory coolers from most decent PC hardware suppliers which you should ONLY apply on a fresh and new graphics card (as it will invalidate your warranty). You are however, entitled to exercising your warranty and requesting an RMA from your vendor. Once you have recieved a replacement card, it may be worth purchasing additional cooling (especially if you have a card that is more susceptible to these issues than others) or just RMA it again when the problems re-surface.
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