5*RX 480 8G Samsung, uber 3.1 straps:
default settings (-h 1800 -dmem 1): ~4920 h/s
my settings (-h 1830,1900 -dmem 1): ~4970 h/s

5*RX 480 4G  Samsung, uber 3.1 straps:
default settings (-h 900 -dmem 1): ~4280 h/s
my settings (-h 1830,1900 -dmem 0): ~4630 h/s