Read in some other postings, that 43Mh/s possible, but Vega models seems to be sensible using the correct driver. I tested last days the Vegs 56 and found, that the AMD mining optimzed driver pushes the hashrate up to 42Mh/s, but with a high power consumption of about 250 Watt at the wall. Using the standard driver 17.9.xx I got up to 38Mh/s with 140Watt only (optimized voltage 875mV, CPU 1000Mhz, Mem 1050mhz), what is not so bad in terms of efficiency - but we all expected much more in the past from these new models.