so I decided to put a rx470 and a 570 on nicehash to help with with my pending balance, but for ages ive uses xmr stak on CN lite which was fine. but now on nicehash mining daggerhash im getting 10 - 13 mhs per gpu, these are 4gb cards on win 7 ultimate, now is it because of win 7 or are 4gb cards no good for mining eth any more? even just using the miner direct I get no change, right now im using lolminer getting 10 and 11sols per gpu mining beam on nicehash. ive formatted today and gone back to stock bios to see if that was the problem still only low hash rates.
If you want to mine ETH with Windows 7 you need to use the Robinhood blockchain drivers. They contain the DAG thrashing fix which is causing the slowdown.
https://bitcointalk.org/index.php?topic=2068446.0Keep in mind you can only do max 4 GPUs with Windows 7, so you are better off upgrading to Win 10 if you got more.
Also make sure to mod your bios straps, either using the SRB tool or manually by strapping the memory straps.
Let me know if you need more help.