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.
Can a Antec EA650 650W PSU take 4870s in crossfire, or 260s in SLi?
And while I am at it can the CORSAIR CMPSU-750TX 750W take 4870x2 in crossfire or 280s in SLi?
Both PSUs will be able to do it easily. If the Antec doesn't have enough connectors, just use some molex to 6 or 8-pin PCI-E adapters and you'll be fine.