Anyone Have 6950 or 6970 card?

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Ordered some of these used 6950 cards for quite cheap, was wondering what kind of hash rate you guys gets from your 6950 when overclocked and flashed to the 6970version?
on the https://litecoin.info/Mining_Hardware_Comparison I can see they can get over 500khs , but Want to actually hear from someone who has this card?