Did some further testing regarding power draw today on single card test bed with an i3 8100 65W processor and a random Seasonic Bronze 430W PSU.
Card used: Vega56 flashed to 64. @ 800mv floor.
Idle powerdraw : 67-72W
Cryptonight powerdraw : 191-195W @ 1950H / 1400mhz / 1100Mhz
Etherium single mining powerdraw: 215-220W @ 44Mh /1200Mhz /1100Mhz
Etherium/DCR dual mining powerdraw: 255-260W @ 44Mh & 1250Mhs / 1200Mhz / 100Mhz
So roughly around:
125W per card for CryptoNight @ 1950
150W per card for Etherium @ 44Mh
190W per card for Dual mining @ 44Mh / 1250Mh
What settings are you using?