Some simple things should probably be considered first.

Depends on what your CPU is and if 80c+ would be considered high/harmful, some have a high thermal tolerance ?
It could be that the heat sink needs to be removed the CPU and heat sink cleaned and good thermal paste applied.

This page gives specs for the i7 3770 and suggests its maximum temp is considerably more than 80c (105c) you mentioned.
http://ark.intel.com/products/65719/Intel-Core-i7-3770-Processor-(8M-Cache-up-to-3_90-GHz)

As craigb suggests bigger fans move more air at lower speeds, but can be increased if required.