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Check your hw; which means hardware errors. It's probably very high because ppl's setting isn't right for your card and your card is not working properly. For R9 290 start with -I 19 -g 1 -w 256. Cgminer usually determines good values of tc or shaders for you so writing them does not make very big difference. This conf should give you around 750 kh/s without errors. Yes higher khash does not mean anything unless your card is working properly what is important is WU value. After that you can trying increasing your memory clock and engine clock little by little to obtain maximum hashrate from you card.
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