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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.