Same! How do you configure the miner to get over 1k? When I try to increase the core clock and go over 1200 and start the miner, I  get either disruptions and see funny colours on my screen or the rig just freezes.
I have noticed also, that the powlim- 50 does not work. No difference if its 50 or 40 or 30... How can I increase my speed to over 815, which is what I am getting from my 580nitro+ SEs... really disappointing, since I get around 31.5mh/s in eth.