Dudes read, it is a normal very old problem. Why so many people ask this question this days?  
R9 290 and R9 390 have DAG issue. There is no fix for this, only mining Coins with lower DAG (CLO, ETHO)



claymore fix this problem? XD no this problem where not fixed by claymore. It was a driver bug, and amd fixed this problem.

I also have more than 10 pieces R9 390 8g and have a problem with hashrate mining ETH

With AMD driver version 18.12.2 and latest 4.1c version, it seems that the fan control did not work here (@RX470/480/570 cards).
Any problems known about this?

Yes I will update my miner to support ProgPow when ETH will be ready to switch to it.

Our rig is mining at a steady 175Mh/s hashrate on Claymore (that's the hashrate shown on the claymore miner). No GPU error, no internet connection issue, everything is super smooth.

How is it possible that our current effective hashrate as shown on ethermine is ... over 200Mh/s ? More than 25Mh/s than our actual hashrate shown on Claymore.

https://imgur.com/MHGqh2i

My confid with Claymore 12.0 & Asus RX580 4GB

1 - AMD Driver 18.12.x (Newest)
2 - AMD ATI Pixel Clock Patcher atikmdag v1.4.6
3 - Claymore 12.0
4 - compute mod - on => AMD-Compute-Switcher for switch automatically to compute mode (at: https://bitcointalk.org/index.php?topic=2815803.0)
5 - Reset computer and working fine now.

what cards u using and what is ur bat file?

Dear friends, I would like to share with you fix for well known DAG problem on RX polaris graphics cards, taken from unofficial beta driver of AMD.


INSTRUCTIONS:

1. Download driver.
https://www.dropbox.com/s/fknhmqdv0k5v3ic/Drivers_DAG_fix_BETA.zip?dl=0
or
https://ufile.io/hw70y


Install driver via Device manager, right click on your card and point to unpacked folder what you previously download from one of the links above.

2. Install well known patcher (atikmdag-patcher), link below.
https://www.monitortests.com/atikmdag-patcher-1.4.5.zip

3. Restart your RIG.

IMPORTANT: You must use Clymore's Dual latest version, at the moment v9.8.
If you want to use AB for clock to then you must download and install latest beta 16 version, but first you need to uninstall version you are using, also delete all the files in ProgramFiles.
Tested, confirmed, AB 4.4.0 beta16 working fine.
http://forums.guru3d.com/showpost.php?p=5459908&postcount=637

INFO:
I personally test on all RX models, from my experience RX470/480 no problem. I put this driver on really huge pool and what to tell you guys, hash result is awesome.
Tested on win10 on all rigs.

If you see this might helpful for you, donation are welcome:

ETH
0x09f940b37fa11fe953e483af9e185098a6b48862

BTC
1HrYKRUNusUGYBKZbV9jHqhbkpDFBpoWz4

Happy mining !
 

Seven days with no new deposits showing in Polonies, wondering what is going on, they are not too good at responding tickets

DAG 136 and so far no fix for Polaris, everytime dag increases Nvidia fanboys make a party hehe

ive never seen that on my other system. claymore does that on your system? a gap all the way down the prompt and different colors on the text that should be 1 color...like the fan are purple, then 1 part of the text is light blue?

what is causing these weird gaps and other colors to load in the claymore console?

http://i.imgur.com/Emr9Jyz.jpg

Hi friends, I was recommended to use this software "aida64" https://mega.nz/#!ZCpH2JqY!CVHs1HUg1MmM2kXlmzUcHEuoAApI8tyPvAlZ4BKMYIQ to monitor the temperatures and fan coolers of my mining pc, which is the one that throws them the most accurate, My Question is if there is a better than this or there is a better or more accurate, I hope someone With good intentions help me please. 

if you will not help us in this matter then why you brag about it ? may be you are testing us to find the solution ? why exactly you tell us if lots of us asked you to share and still you don't . we can help you by testing this fix with you

raise core and voltage

I heard 1060 / 1070 cards were unaffected by hashrate drop.
AMD 4xx/5xx cards also suffer from this. For every DAG Epoch, be ready for hashrate drop.