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 went from crossfire 1900's to a 4870x2, ridiculous improvement.
I would say that you will notice no difference in a 2900 at least with AA. Might be wrong but when crossfire works, although not dx10 they are powerful and the 2900 isn't that great.