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.
I'm using hx1000i and the power usage in watt given by corsair link 800-900 watt. I'm on Matrix 7970 plantinum crossfire with Asus HD7990 ( water cooled )
Please remember that 7990 does not have UEFI enable bios. Therefore it should setup as second gpu if you go for uefi setup