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've owned both: the 4890 sounds like a jet taking off, while the GTX 260 is barely audible inside my P182. With that said, the 4890 I owned was an XFX and had an annoying squeal at all times, and the 260 is an eVGA.