my xfx 5830 has been running for 3 weeks at stock voltage 400mhz memory and 1ghz core. never goes over 68c i only get 300mh/s though with phoenix with phatk.
edit: tried worksize 256 and i got 10mh/s more! weird poclbm gave me less with ws at 256.
My XFX seems to get REALLY unstable after 925mhz core, and I've tried lowering my memory clock to 275mhz. Can I ask what driver version and stream SDK you're using? What software did you use to overclock, and what miner are you using? Trying to push the most out of it if at all possible.