Hash drop

[bvarner8]

Have 5 Power Color Red Devil Rx 580s and a radeon rx 480 running on a AS ROCK H81 PRO BTC 2.0.

Had the 580s hashing at 30/mh  each and the 480 at 24/mh Windows 10 and block chain drivers.
Came home to windows update and the 580s running at about 20/mh each.  I hate running windows 10, So I decided to just do a fresh install of windows 7 64 bit.
Fresh install, block chain drivers = still low hash rating. I've switched the Bios setting and to quiet and that drops me to about 15/mh per card.
I've updated the AMD drivers to the most current and still at 20mh. I've changed the power supply, motherboard, risers/cables, and still no luck.
I flashed to another bios and still no luck. This happened about a month ago and while playing around with the system Everything started to hash at correct speeds.


Has anyone had this issue or have any ideas on what to try next. Find it odd that this has happened again and to all of the cards at one time.

This is link to bios I originally used. Posted by Frosty.
https://anorak.tech/t/powercolor-rx-580-red-devil-8g-ram-hynix/6869/3

Direct link
https://anorak.tech/uploads/default/original/2X/e/ef5efc1d65c6790e419abf44b9b8f0b7ef2a0ab7.rom   

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[Vann]

With the latest AMD drivers you need to toggle compute mode from graphics in AMD settings.

https://support.amd.com/en-us/kb-articles/Pages/DH-024.aspx

You can disable drivers updates in Windows Update, so the GPU drivers are not updated automatically.

gpedit ==> Computer Configuration ==> Administrative Templates ==> Windows Components ==> Windows Update and set 'Do not include drivers with Windows Update' to enabled.

Also AFAIK, with Windows 7 the official blockchain drivers from AMD are broken. The only blockchain drivers reported to work on Windows 7 are the Robinhood drivers.

https://bitcointalk.org/index.php?topic=2068446.0