PiMP OS Can still mine ETH with 4gb GPU's. There's a few supported miners, Teamredminer, lolminer, bminer to name a few. The trade-off is.. where you may have been getting a stable 29-30mh/s from many 4gb gpu's, like rx570's for example.. you will now only get 21-24mh/s per gpu, and power consumption will remain the same.. so you'll have to do your math. I tested on bminer, had it all mining stable (an 8 x gpu rig of 4gb rx570's), was getting 23mh/s at about 74w. When I checked the free Vram.. there was only like 3mb per card.. so the ETH-DEATH reaper will catch you eventually, and setting up another miner to squeeze ETH for perhaps another week or so may not be the best idea.
Plenty of other coins out there, and with recent increases in price, hopefully the "next bitcoin" is just around the corner.
Happy mining all, and seasons greetings!