I know this thread is pretty much dead, (much love to Wolf0 and scrpytr for developing/supporting this version)

 I love sgminer for my 560/570 rig, but I just can't seem to get it to work nicely with my other rig which is all 270/270x. 


      {
            "name": "xmr",
            "algorithm": "cryptonight",
            "rawintensity": "504",
            "worksize": "8",
            "gpu-threads": "1"
        }

This is the best I've come up with, getting ~360h/s per card.  Claymore 9.7 does ~430h/s per card.  (10.2/11 doesn't work well for me)

If anyone has any other numbers to try, I'd be more than happy to try them out.  I'd much rather use sgminer across all my rigs.