As the size of the Ethereum blockchain continues to increase, ETH mining requires GPU cards with more memory to store DAG files. Starting from about October 17, 2020 UTC, it will no longer be possible to mine ETH with 4G GPU cards on Windows machines.
In order to continue mining with 4G GPU cards, please try one of the solutions below.
1. Switch to Linux or a dedicated mining operating system. ETH can be mined with 4G GPU cards using these operating systems until the end of December 2020.
2. Increase memory size to 8GB to avoid future problems caused by the increasing size of the DAG file.
3. Start mining other coins, such as BEAM, RVN, SERO, etc. You can check the daily revenue of these coins here before making a decision.