Good to see the hash has started to spread a bit beyond one pool.  I switched from coin-miners to hardcoreminers to try and spread it some more, I would suggest some others do the same or the OP remove it and put a notice not to just pick the first pool or the highest hashrate pool on the main page next to the pool listings.

With the updated AMD gpu miner I am able to get about 1.1Kh/s on a r7 270 clocked at 950Mhz core.  Can not bring the intensity up beyond 8 or they crash and with a worksize of 8 I was only getting about 800H/s.  Temp tops at about 34 but the indoor temp is 20 inside right now.  Pretty close to what an fx8350 can pull.  Should give a decent basis for someone else running something near the same or who wants to run a two part or multi pool failover.

run.bat
del *.bin
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
sgminer.exe --config sgminer.conf

config

{
"pools" : [
        {
      "url" : "stratum+tcp://stratum.eu.sup.hardcoreminers.com:3022",
      "user" : "nightshade00013.N",
      "pass" : "L"
   },
   {
      "url" : "stratum+tcp://stratum.coin-miners.info:3637",
      "user" : "nightshade00013.N",
      "pass" : "L"
   },
        {
      "url" : "stratum+tcp://sup.suprnova.cc:7777",
      "user" : "nightshade00013.N",
      "pass" : "L"
   }
]
,
"intensity" : "8",
"worksize" : "16",
"kernel" : "pluck",
"thread-concurrency" : "256",
"gpu-threads" : "1",
"vectors" : "1",
"temp-cutoff" : "60",
"temp-overheat" : "55",
"temp-target" : "45",
"expiry" : "120",
"failover-only" : true,
"hotplug" : "5",
"failover-switch-delay" : "60",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "7",
"tcp-keepalive" : "30",
"temp-hysteresis" : "5",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

Mining on a pair of 6850's is basically crash city or 200H/s. . . seems they only like x11 coins at this point but they are factory overclocked and I think it has something do do with the memory speed and voltages.