The problem is the sdk version, you must install the 2.5.
It happened to me too with similar cards, 5830 and 6950.
You can install the sdk 2.5, or just copy this files and replaces existing ones.
http://www.mediafire.com/download/tc4eh1sb1b1l4sh/AMD-APP-SDK-v2.5.rarWhen you open cgminer again it will create the .bin files and hopefully won't crash.
If that works for you, you are welcome

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