Sometimes if you use CCC to overclock on newer cards it won't allow it. I had that problem with my XFX 4890 XXX edtion (900mhz stock, watercooled). CCC would give me zero stable overclock if I set it to auto but if I manually overclocked the card it overclocked fine.
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GAMER: Win7 Pro x64, Q9550 @ 3.6Ghz (Coolit ECO A.L.C.), Asus P5Q Pro Turbo, XFX 6950 2GB (EK FC watercooled), Gskill 4x2GB DDRII 1066, OCZ Vertex + 120GB, Intel X25-M 160GB, 1TB WD Blk, DVD, BRD, HX620W, Auz X-Fi Prelude, Intel Pro CT Gbit NIC & CM Cosmos
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