Found it on 1stminingrig, post from Otto, I'm just pasting so all credits to him:
Hi all!
After testing all day Im found one solution for undervolting with new beta driver which one works:) Maybe its a little bit primitive but working for sure for those who has rx5xx series cards. First I share my hardware. I have 7 pieces Sapphire rx580 Nitro+ 8gb limited edition in one rig. Here are what Im do:
- I have moded bios that one that Cirpian V. share with us in his blog.
- First Im remove the old one driver from the system with DDU in safe mode.
- Than I put the new one beta driver
http://support.amd.com/en-u...
- Than Im install the new beta 4.4.0. 16 AB.
As many people than I have problem with undervolting. All my cards consume much more energie than before (1030-1080 mv / card with settings cc1200 mc2225) and I have also problem with heating. After all that Im do next:
- Im open WattMan in AMD's software than I click on Gaming / Global Settings / Global WattMan and chose the first card. Than Im going to change to MANUAL on voltage control and than APPLY in right top corner of the screen. Than again change it to AUTOMATIC and than apply. To do that is really Important. Than you can check in AB the voltage low down to 830-840mv. You have to do this with every single card. Also important to do this all when claymore was runing!
The only problem with this that if you shut down claymore ,or you restart your rig WattMat forget all setting and you have to repeat all theese setup. Try it, it WORK's.
If you have any questions with my setting do not hesitate to ask. If you try it and it's work than buy me a beer
))))
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