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R9 390 Undervolting and Bios Optimizations

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Just wondering if there are any owners of the 390 that were successful in achieving efficiencies greater than 7W/MHS?

Going mostly by
https://bitcointalk.org/index.php?topic=1465128.0


I managed to get 7.2W/MHS with my ASUS R9 390 STRIX at (1.03Volts - shown in GPU-z/MSI Afterburner) @ 1050/1500.

Going any higher on clockrate or lower on voltage freezes the system. So just wondering what combination everyone is using.

This is ETH solo. Not dual. This was done with a BIOS flash of a editted ROM file in HawaiiBiosReader and not in the MSI Afterburner software.

Would be nice to get 6W/MHS and I can get a bunch of these instead of the 470/480 since they are cheaper and hash faster.

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