Hash Rate drops when adding 4th GPU

I do not know whether I am asking this question in the correct place because I think I am running a branch of this that uses SK1024-nobody which is HappinessInAutism/skminer-amd forked from djm34/skminer-amd This though is the only source on GitHub that will allow me to raise an issue!!

Anyhow I am on windows 10 and am running four rx580 GPU. The configuration file looks like this

{ "connections" : [ { "url" : "eu.nexuspool.ru.com:8333", "user" : "2QiifwHhNVEiE3m3BWRqekmpnoWkhgzjzfC7uB4dkp7bmtYFav3", "password" : "x" } ],

"algorithm" : "sk1024_nobody",
"gpu-engine" : "0,0,0,0",
"gpu-memclock" : "2165,2165,2165,2165",
"gpu-shaders" : "1792,1792,1792,1792",
"gpu-threads" : "1,1,1,1",
"gpu-vddc" : "0,0,0,0",
"gpu-powertune" : "0,0,0,0",
"intensity" : "22,22,22,22",
"xintensity" : "0,0,0,0",
"rawintensity" : "0,0,0,0",
"thread-concurrency" : "15232,15232,15232,15232",
"lookup-gap" : "2,2,2,2",
"worksize" : "64,64,64,64",
"temp-target" : "65,65,65,65",
"temp-overheat" : "80,80,80,80",
"temp-cutoff" : "95,95,95,95",
"auto-engine" : "false,false,false,false",
"auto-fan" : "true,true,true,true",
"submit-stale" : "false,false,false,false",
"vectors" : "1,1,1,1",
"devices" : "1,2,3"

}

When I mine with 1 2 or 3 cards 1 am gettting 100 Mh/s for each card giving around 300 total . When ever I add a fourth card ..and importantly is does not matter which one..the hash rate drops to single digits. I have set 48000 mb of virtual ram. Any ideas

Thanks for any help

lrussellgd / SKMiner

Hash Rate drops when adding 4th GPU #4