latest cgminer and result for 290x - 14000, 290 - 12400, 280x - 10000, 270 - 6000 say please it normal ?
6400 Kh/s (6.4Mh/s) for me on 270 and 6700 Kh/s (6.7Mh/s) on 270x. None are tweaked, just core 1100 for 270 and core 1175 for 270x. Hope that helps.