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i have an offer of sapphire 6850 @ 6.5k and evga super overclocked 460 @ 5800 [without warranty] please help me decide i will buy today itself *www.rage3d.com/reviews/video/evga_gtx_460_sc/ *www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1037&pid=973&psn=&lid=1&leg=0