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 temps will increase, yes, because the cpu will now draw more amps at the same voltage to run at that higher speed, disspitaing more energy and resulting in higher temps. Theoretically, just changing the voltage and not the fsb would not increase temps at all, since the cpu would run at the same speed and draw the same power. However, it is not normally a significant temp increase as long as your cooling is adequate.