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.
Your chipset voltage is too high, thats why. The NF4 chipset is normally good for 300+ HTT even with 1.5 volts, theres no way yours needs 1.77v. Go into your BIOS and lower it, and those temps should drop down nicely.
I recommend taking the stock plastic casing around the 7800's hs off and throwing a 80mm fan over it. I did that, attached with a zip-tie, some like to screw into hs. Cools 7800 big time and keeps it from blowing hot air directly over chipset.