Directed my mates rig to Turtlecoin, nice project! According to
https://www.cryptunit.com/device/570 each 570 should get 29.5 kH/s, but his 570 4GB only get ~20kH/s. Is it because his cards only have 4gb and not 8gb? Tried TRM and SRBMiner with very similar results, currently @ 1000MHz Core and 2000MHz Memory.
Have you experimented more on RX 470 4GB settings?
I'm also getting only 20 Kh/s on them.