This is my config for new sgminer 5 multi with x11-x13mod and work for me fine
i have two card 290-7950

{
"pools" : [
        {
                "name" : "NiceHash_X13",
                "url" : "stratum+tcp://stratum.nicehash.com:4337",
                "user" : "13zxUiNJvcTyeSDiVDRkE74QSh6b9rrPvZ",
      "pass" : "f0=0;f2=0;f3=4;f4=3;f5=0",
      "pool-nfactor" : "10",
                "pool-algorithm" : "marucoin-mod",
                "pool-gpu-engine" : "1040,1050",
           "pool-gpu-memclock" : "1500,1500",
                "pool-thread-concurrency" : "24550,8193"
        },
        {
                "name" : "NiceHash_X11",
                "url" : "stratum+tcp://stratum.nicehash.com:4336",
                "user" : "13zxUiNJvcTyeSDiVDRkE74QSh6b9rrPvZ",
      "pass" : "f0=0;f2=0;f3=4;f4=3;f5=0",
      "pool-nfactor" : "10",
                "pool-algorithm" : "darkcoin-mod",
                "pool-gpu-engine" : "1040,1050",
           "pool-gpu-memclock" : "1500,1500",
                "pool-thread-concurrency" : "24550,8193"
        },
        {
                "name" : "NiceHash_X11 FIX",
                "url" : "stratum+tcp://stratum.nicehash.com:3336",
                "user" : "13zxUiNJvcTyeSDiVDRkE74QSh6b9rrPvZ",
      "pass" : "x",
      "pool-algorithm" : "darkcoin-mod",
                "pool-gpu-engine" : "1040,1050",
           "pool-gpu-memclock" : "1500,1500",
                "pool-thread-concurrency" : "24550,8193"
        },
        {
                "name" : "NiceHash_X13 FIX",
                "url" : "stratum+tcp://stratum.nicehash.com:3337",
                "user" : "13zxUiNJvcTyeSDiVDRkE74QSh6b9rrPvZ",
      "pass" : "x",
                "pool-algorithm" : "marucoin-mod",
                "pool-gpu-engine" : "1040,1050",
           "pool-gpu-memclock" : "1500,1500",
                "pool-thread-concurrency" : "24550,8193"
        }
]
,
"xintensity" : "350,300",
"worksize" : "128",
"algorithm" : "marucoin-mod",
"hamsi-expand-big" : "1,1",
"lookup-gap" : "0",
"thread-concurrency" : "24550,8193",
"shaders" : "0",
"gpu-threads" : "4",
"gpu-engine" : "1040,1050",
"gpu-fan" : "50,50",
"gpu-memclock" : "1500,1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "0,20",
"gpu-vddc" : "0.969,0",
"auto-fan" : true,
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "85",
"api-allow" : "W:127.0.0.1,W:192.168.1.4",
"api-mcast-port" : "4028",
"api-port" : "4028",
"api-listen" : true,
"api-port" : "4028",
"expiry" : "28",
"failover-switch-delay" : "60",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"log" : "5",
"no-pool-disable" : true,
"no-client-reconnect" : true,
"queue" : "1",
"scan-time" : "7",
"tcp-keepalive" : "30",
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/i586-mingw32msvc/bin",
"kernel" : "ckolivas"
}