rx 580 4GB for mining XHV

[zaliali]

hi all
my default amd.txt is this
// gpu: Ellesmere memory:3711
// compute units: 36
{ "index" : 0,
"intensity" : 864, "worksize" : 8,
"affine_to_cpu" : false, "strided_index" : 1, "mem_chunk" : 2,
"unroll" : 8, "comp_mode" : true
},

i change these parameters
intensity from 864 to 952
strided_index from 1 to 2
unroll from 8 to 16

and now it looks like this
// gpu: Ellesmere memory:3711
// compute units: 36
{ "index" : 0,
"intensity" : 952, "worksize" : 8,
"affine_to_cpu" : false, "strided_index" : 2, "mem_chunk" : 2,
"unroll" : 16, "comp_mode" : true
},

but still have about 740 H/s for GPU
is it normal in mining XHV?