I'm user of RX 470(570) 4GB. The problem is, the DAG file size is already getting too big. Windows 10 takes about 0,5GB of VRAM, and the epoch over #317 is already too big, and the miner is starting to take memory from system RAM, so the speeds slows down from 27-28 to 19-20MH/s.
Can i somehow reduce reserved VRAM of Windows 10?
And can i choose what DAG epoch to use? Because sometimes when the miner chooses smaller epoch #317 the speed is 27,5 MH/s, but after some time it switches to epoch over #318 and it's bigger so the memory is getting choked and the speed is going down to 19-20 MH/s.