I can mine with 3GB cards using Linux for some more time. I forgot the epoch value when Etherium Classic stopped working (Was it 231 or 237? damn that I did not wrote that somewhere).
DO NOT REBOOT YOUR rigs WITH 3GB CARDS IF THEY ARE STILL MINING - YOU WILL RECEIVE DAG FILE ERROR AFTER REBOOT
I have 3 rigs. 2 were rebooted on ETH DAG#229 and stopped mining. The third one was working nice until today it was rebooted. After reboot - DAG error
I used -eres 0 command in claymore and it helped. But I think in epoch #231 it will stop again