Yes use -rvram -1 or NBminer maby it works better,i think maby Phoenixminer developer is dead !!!
This worked for me too. That DAG epoch change caused 3 rigs to crash this morning. 4GB cards are getting tight now...
That was literally the first thing I said...
In the case of mixed rigs with 8gb and 4gb cards, what will be the behavior? I seemed to have understood that if there is at least an 8GB card the rig should continue to work correctly, is it correct?
I think the lead card (GPU0) is better with 8GB VRAM as it reserves more than the rest if you check GPU memory usage in MSI Afterburner, or you can try integrated graphics for the main display output but I had problems with not being able to control the GPU voltages after that - that was nearly 2 years ago that I last tried though.
It would be interesting to understand now if it is working because this would allow to keep the 4Gb cards having only 1 8Gb card