i have been used claymore for my rigs
but i have some of them with 4gb cards
i have tested a rig: 6 x amd rx 570 4gb

with claymore this setup i have made 187.3 MH/s
-cclock 1200,1200,1220,1220,1200,1200
-mclock 2000,2080,2100,2100,2050,2060
-cvddc 900
-mvddc 900
-ethi 16
-tt -100
-eres 1
-gser 2
-y 1
-tstop 90
-rxboost 1
-strap 1

and with phoenixminer i have only 183.32 MH/s
-cclock 1200,1200,1220,1220,1200,1200
-mclock 2000,2080,2100,2100,2050,2060
-cvddc 900
-mvddc 900
-tt -100
-eres 1
-gser 2
-acm
-tstop 90

What i am missing ?