As Ethereum mining has become more and more popular, it has become evident that 4GB GPUs are not enough to mine Ethereum effectively anymore. This is because the DAG file, which is used by the Ethereum mining software to calculate hashes, has become too large for 4GB GPUs to handle.
As a result, if you want to mine Ethereum, you will need to have a GPU with at least 8GB of memory.
The good news is that there are still some 4GB GPUs on the market that can be used for Ethereum mining, but they are not as effective as they used to be. If you have a 4GB GPU and you are thinking about upgrading to an 8GB GPU, it is probably worth it in terms of mining performance.
However, if you only have a 4GB GPU and you don’t want to upgrade, you can still mine Ethereum, but your mining profits will probably not be as high as they could be.