That is too hot, according to BitTech the H80i is at least 10°C cooler under load than the Noctua NH-L12 I am using.
Using default settings with RAM SPD (1333 1.5v) and 4x44 turbo my OCCT test with a good replacement CPU and NH-L12 is as follows, as posted in this thread #36.
It is maxing at 79°C. If yours exceeds this with the H80i then there is something wrong but you need to eliminate the cooler seating.
My advice is,
- Check you have latest OCCT.
- Check seating of the CPU block. Corsair are known to be tricky to seat on many motherboards and I read the fix is to add non conductive spacer washers to the backplate to pull the block in closer.