Get ready to move on Linux slowly. Windows reserves 300 + MB of VRAM. The current DAG size is 3.57gb. The Phoenix miner free vram check was set to 384mb by def.  When the dag + win reservation is taken away from 4gb vram, only 130MB of vram is left (that's why Phoenix made the problem). And with the command -rvram -1 you have time up to DAG 3.7gb or ~ 1.7.2020. After that, Linux....until 21.12.2020.