I guess the miner feature to increase ethash support on 4GB GPUs is not working with the old Blockchain drivers (22.19.659.1)?
I honestly dont know, havent tested. The reason is that you need newer drivers anyway to maximize the epoch for 4GBs, they have an overall lower memory footprint. I believe something like >= 19.11.3 is enough, but not 100% sure where they reduced the initial vram used.
Phoenix maded some research about AMD drivers. Here his conslusions:
After extensive testing of AMD Windows drivers for the last two years or so, we identified two broad groups of drivers:
- Good drivers. These are versions from 18.12.1.1 to 19.7.5 (inclusive), and from 19.12.2 to 20.4.2 (inclusive). These will allow you to mine until DAG epoch 372-373 and won't need restart of PhoenixMiner on each DAG epoch change.
- Not so good drivers. These are versions 18.1.1 to 18.10.1 (inclusive), and from 19.8.1 to 19.12.1 (inclusive). This will allow you to mine until DAG epoch 365-366 and will require restart of PhoenixMiner on each DAG epoch change (for these drivers this will be preformed automatically unless you have added -dagrestart 0 command-line option to explicitly disable the auto-restart).
- Drivers older than 18.1.1 were not tested for 4 GB DAG operation.
It can be useful for 4Gb cards owners.