Sorry for the delay in response, went on short vacation.

@Wolf0 Stilt's BIOS really helped! I'm up to 875-900 Kh/s with your settings.

@jrrsparkles I tried bringing down the intensity. At 10-12, my hashrate is 144Kh/s... 20 works better for me.

Question: How much can finding the "perfect" TC help my hashrate? Should I put in the effort to do trial and error?

SAPPHIRE TRI-X OC 100361-2SR Radeon R9 290X 4GB 512-Bit

My config is:
"intensity" : "20",
"xintensity" : "0",
"rawintensity" : "0",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "24550",
"shaders" : "0",
"gpu-threads" : "1",
"gpu-engine" : "945",
"gpu-fan" : "90",
"gpu-memclock" : "1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "20",
"gpu-vddc" : "0.000",
"temp-cutoff" : "90",
"temp-overheat" : "85",
"temp-target" : "75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"failover-switch-delay" : "60",
"gpu-dyninterval" : "7",
"gpu-platform" : "1",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "60",
"tcp-keepalive" : "30",
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"

From what I've heard, people are maintaining speed of 850-900 Kh/s. I've tried so many different setting and configurations, is my card defective?

Yes, it is in my PC. I use my PC like once a month, so I figured it would be fine. Mostly I work on my laptop.

I underclocked it, and slowly brought it back up. It seems to be working now. Fingers crossed it will stay stable through the night.

Hello, I have a R9 290x and no matter what configuration of settings I try, the display driver crashes and I get 0kh/s in SGminer. As soon as I open it, a little bubble appears that says the display driver stopped responding and recovered. I have tried different versions of drivers, different versions of the app sdk, I used Display Driver Uninstaller and completely wiped all driver settings... what do I do now?

Figured it out!

(Yes, I'm on windows)

I used --gpu-platform 1 and it began mining at 664 kh/s! Confirmed it was the right card doing the work with GPU-Z (A nice little gpu monitor), and now I just have to work on tuning it to max out the kh/s.
Thanks for your help, what's your BTC/LTC address?

When I run sgminer -n I get this: imgur.com/OXeZ0cV

As far as I can tell, it can only see one GPU. How do I know which GPU is 0 and which is 1 when I run sgminer with -d?

Thanks, I'll try that.

Hi! I really need some help. I have been trying different settings I've found for this card, the Sapphire 290x, and I can't get it to work. I have another card, a GTX 660 Ti (obviously not for mining), that I wanted to use to run the two displays connected to my computer. However, whenever I would try to mine, cgminer would ignore the 290x and try to mine on the 660 Ti. I ended up removing the 660 Ti from my system and connecting the displays to the 290x, but when I try to mine the display drivers crash and it mines at 0 kh/s. I would like to put the 660 Ti back in and use it for the displays, but not for mining. If that is not possible, what are some cgminer setting that won't crash the display drivers? Thanks for the help!