Lowers Hash rate msi amd 480/4gb bajo MH S con RVN

I am mining RVN with 3x480 4gb and 2x580 8gb
The fact is that all the gpu throw me a hastrate too low, approx 8.5 MH / S.
Up to the 580 that should deliver 25-29 MHS, they give much lower values.
Could someone help me raise the MHS?
Thanks.

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