1 av 4 280x kort går i 100 Kh/s mindre än dem andra

{
    "pools": [
        {
            "url" : "http://eu.bitcrush.info:3444",
    "user" : "RickardP.Miner1",
    "pass" : "asdf"
  },
  {
    "url" : "http://eu2.bitcrush.info:3444",
    "user" : "RickardP.Miner1",
    "pass" : "asdf"
  },
  {
    "url" : "http://us.bitcrush.info:3444",
    "user" : "RickardP.Miner1",
    "pass" : "asdf"
  }
    ],
    "gpu-reorder": true,
    "intensity" : "13",
    "vectors": "1",
    "worksize": "256",
    "lookup-gap": "2",
    "thread-concurrency": "8192",
    "shaders" : "2048",
    "gpu-engine" : "1070",
    "gpu-memclock" : "1500",
    "gpu-memdiff" : "0",
    "gpu-powertune" : "20",
    "gpu-vddc" : "1.075",
    "temp-cutoff" : "90",
    "temp-overheat" : "84",
    "temp-target" : "78",
    "gpu-reorder" : true,
    "api-listen" : true,
    "api-mcast-port" : "4028",
    "api-port" : "4028",
    "api-network" : "true",
    "auto-gpu" : false,
    "auto-fan" : true,
    "expiry" : "30",
    "gpu-dyninterval" : "7",
    "gpu-platform" : "0",
    "gpu-threads" : "2",
    "gpu-reorder" : true,
    "log" : "5",
    "no-pool-disable" : true,
    "queue" : "0",
    "scan-time" : "1",
    "scrypt-vert" : true,
    "temp-hysteresis" : "3",
    "shares" : "0",
    "kernel-path" : "/usr/local/bin",
    "api-allow" : "W:0/0"
}