i also found this http://1stminingrig.com/unofficial-amd-driver-fix-for-ethereum-dag-epoch-released/
it might be useful
Topic: AMD Releases Driver for DAG Issue !!! - page 14. (Read 28841 times)
My 580's got about 1.2Mh/s increase Solo mining Eth. You'll have to use the new Beta afterburner to OC. http://forums.guru3d.com/showpost.php?p=5459908&postcount=637
Rx570 @ 27,2 mh/s ETH and 707 mh/s DCR with dcri 26 and claymore 9.8 dual mining.
Thanks for the update will give it try. 
Well, AMD Released a driver for DAG issue, still have to experiment with this driver.
Try it out in your Radeon Rigs too and provide feedback for the same.
Link to the post, where I found it: http://www.legitreviews.com/amds-new-mining-block-chain-optimized-driver-tested_197095
Link to the beta drivers: https://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-Blockchain-Compute-Release-Notes.aspx
I guess AMD won't release any updates to this driver, so this might be it.
Try it out in your Radeon Rigs too and provide feedback for the same.
Link to the post, where I found it: http://www.legitreviews.com/amds-new-mining-block-chain-optimized-driver-tested_197095
Link to the beta drivers: https://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-Blockchain-Compute-Release-Notes.aspx
I guess AMD won't release any updates to this driver, so this might be it.
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