If your rig got celeron, Pentium G32XX. Do use -i 0. Even -i 1 will reduced your hashrate. My RX480 on G3260 with -i 0 around 62-65sols. If i set to -i 1, it reduced to 51-55sols

My rig with i7 3770 RX480 8GB with -i 2 can hit 65-69sols max. CPU usage is around 33%.