Since ETH is slowly approaching 4GB DAG size and ETC already exceeded it, 4GB GPUs have troubles mining these two coins. ETC is planning a fork at block 11,700,000, which will decrease the DAG size, but since this is scheduled for the end of November, you might wonder what to do in the meantime. You can find DAG sizes of different Ethash coins and forks on our DAG size calculator and calendar.
Developer of lolMiner introduced a zombie mode, which will help 4GB GPUs mine Ethereum for a few more weeks, however, with reduced hashrate.
Zombie mode will work on Linux and Windows, but the performance has shown to be best at Linux.
To test it, you can run the following configuration on Linux and Windows.
If the miner boots up, then your
--keepfree parameter value is suitable or a little bit too high - but it works. You can also try to adjust
--keepfree parameter to make it right. LolMiner developer suggests to decrease it for 8 Mbytes - in Linux from 5 to 0 and in Windows from 56 to 48.
If it doesn't boot up, then your
--keepfree parameter value was too low, and you will need to increase it by 8. Keep doing it until, your mining client boots up.
When you find the perfect value for your
--keepfree parameter, you can add it to your lolMiner configuration and start mining.
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