i'm mining on a 4 computers, 3 around 500-600 H/m, one around 1000-1100 H/m.  The system with larger hash has not shown scaled returns, the system with the largest returns is used for nothing but mining, I suspect blocks found is potentially decreased due to other system processes despite having double the H/m.  my best performer is an intel i3 running minimal processes.  all running individual wallets.