My config:

Sapphire AMD R9 290X Tri-x : 2.647 MH/s

Windows 8 and 'sgminer 4.1.0-103-g0015'.

sgminer.conf:

{
"pools" : [
   {
      "url" : "stratum+tcp://mining.darkcointalk.org:3333",
      "user" : "worker.1",
      "pass" : "x"
   },
   {
      "url" : "stratum+tcp://drkpool.com:3333",
      "user" : "worker.1",
      "pass" : "x"
   }
]
,
"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"kernel" : "darkcoin",
"lookup-gap" : "2",
"thread-concurrency" : "33765",
"shaders" : "0",
"gpu-engine" : "960",
"gpu-fan" : "auto",
"gpu-memclock" : "1450",
"gpu-memdiff" : "0",
"gpu-powertune" : "50",
"gpu-vddc" : "0",
"temp-cutoff" : "95",
"temp-overheat" : "90",
"temp-target" : "85",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "60",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}