USE THIS DRIVERS AT YOUR OWN RISK!!!
Important Notes:
This driver is provided as a beta level support driver which should be considered "as is" and will not be supported with further updates, upgrades or bug fixes.
This driver is not intended for graphics or gaming workloads.
64 Bit drivers for Windows 10 & Windows 7 updated to include support for Radeon™ Vega Frontier Edition (8/23/2017)
Check out this article http://1stminingrig.com/unofficial-amd-driver-fix-for-ethereum-dag-epoch-released/
HASHRATES
Apparently this new driver does affect hashrate positively in some cases. The most positive changes are:
RX 580
From 27.2 to 28.1 MH/s
From 24.5 to 28 MH/s
From 28.5 to 29.6MH/s
RX 480
From 20 to 21 MH/s while dual mining ETH and Siacoin.
No change in power usage
RX 470
From 25.5 to 27-28 MH/s
Though in this case there were some stability issues. Also, the user who achieved those results was not able to undervolt the card.
Just switching to this driver raised my hash rates on all of my cards 1 to 2 mh/s but obviously results may vary.