Im in the same boat. I can't get my 270 to hash x11 for any length of time. It also needs a hard reboot. Hopefully some one can get it going for us 270 guys,
Now I'm testing this config:
{
"pools" : [
{
"url" : "stratum+tcp://super.pool.com:3333",
"user" : "user.rig",
"pass" : "x"
}
]
,
"auto-fan" : true,
"auto-gpu" : true,
"temp-cutoff" : "80",
"temp-overheat" : "75",
"temp-target" : "60",
"temp-hysteresis" : "2",
"gpu-fan" : "20-100",
"gpu-engine" : "1000-1100",
"gpu-memclock" : "1250-1500",
"gpu-platform" : "0",
"gpu-threads" : "2",
"gpu-powertune" : "0",
"thread-concurrency" : "0",
"shaders" : "1280",
"xintensity" : "512",
"api-listen" : true,
"api-allow" : "W:127.0.0.1",
"api-port" : "4028",
"vectors" : "1",
"worksize" : "128",
"kernel" : "x11mod",
"log" : "5",
"no-pool-disable" : true,
"no-submit-stale" : true,
"expiry" : "30",
"scan-time" : "30",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}
Try it. Change only pool and username to yours.