If you're lucky, you might find a Vega 64 vbios for that same card (if they made em both 56 & 64), which is unique.. not much out there, Pulse, only 56 afaik.
That however doesn't mean they're crappy, i've got a Sapphire Pulse with Hynix memory and it's running smooth at 47~Mh (memory at 975).
Got a Samsung Vega56 too and hits 48+Mh..
I have my Sapphire Pulse Vega56 Hynix one bios flashed to Nitro 64 for eth, it is working ok at 1040 mem clock than.
But for cryptonight it is better to stay with original bios for low power with almost the same hash rate.