Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
The reason why Vega has less memory bandwidth is AMD improved their DCC algorithms from Fiji. Hawaii didn't even have DCC. Though you can always bump memory clock back up to 1000MHz to get the same 512GB/s as Fiji. Also because SK Hynix dropped the ball on 2Gbps HBM2, forcing AMD to use OC'd...