Sapphire HD6950 2GB DiRT3 Toxic Edition

Another incredible thing about this card is that it was unlockable — meaning that I was able to flash it to an HD6970 BIOS, unlocking the total 1536 shader cores over the stock 1408. With the extra 10% of shader cores at my disposal, I reran the overclocked benchmarks and discovered a steady jump in performance by anywhere between 6%-8% running at the same 1010/1500MHz. Granted, not all cards can do this from the factory, as they are physically cut. I can't say whether all these cards are unlockable, but it doesn't hurt to try.