It seems the Dag file hit 3 GB, i keep getting out of memory on my 1060 3 GB mining ETH/ETC.
I guess this Month is it instead of next month ....
https://investoon.com/tools/dag_sizeAt this rate that could mean 4 GB cards won't be usable for ETH/ETC mining in May/June instead of SEP 2018 .
Not sure where you are timing this all out but 3gb cards should be good for a long time still Investoon.com shows 03/MAY/2019 as the hard end of life for 3gb gpu ethereum on block . Run on linux if windows is an issue. If you are looking at any calculations before the byz hard fork in October just remeber that the block times changed with that and adjusted how long all cards have based on DAG alone. Here is an example of a decent projection.
DAG-3gb Epoch-256 Date-03/may/2019