I now have a Vega 56 card flashed to vega 64 for better performance. But the FPS is not enough for 4k gaming. I just bought another Vega 56 that I plan to flash with Vega 64 bios. I hope I do NOT need a crossfire bridge in order for these cards to work together, as one was not provided with the motherboard. Also would like to know if I buy a Vega 64 can it work together with a Vega 56 card ?? If it can I will sell the second Vega 56 card. Iplan on running the two cards together in power saving mode with my 860 watt power supply.