I have 6 RX-580's. 4 have 8gb mem and 2 have 4gb mem.
4 run between 30 and 31 mh/s
2 run between 29 and 30 mh/s
They 2 Gigabyte, 2 ASUS, 1 PowerColor, 1 Sapphire PULSE
Memory varies between Samsung and Hynix
Hynix @ 29-30, awesome!
I think mine Hynix make 28-29.
I'll annoy you via pm for the timings later ; )