I just uploaded Beginners guide for Rx Vega 64 Part 2 - in this video I show you how to flash your bios to vega 56 as vega 56 has some clear advantages over vega 64, such as :
1. Same hashrate
2. Power consumption lower for about 30 - 40W per card
3. Lower temperatures
4. More stability

https://youtu.be/K6liogZfg_c