Sorry, thought your CPU was at 4.4GHz, not 3.4GHz, should have looked closer, my bad.
First off, your case fan setup sounds OK, cool air in the front, hot air out the back. Yes, check your heatsink is secure and tight to the m/board. And agree, check your thermal paste and/or change it with AC5 or similar.
gooseta, yes the fan is running at 1100rpm but at 89C, surley it should be running alot faster than that???
Check your BIOS settings? AMD has Cool'n'Quiet for its CPU's, can't remeber what Intel have. Do you use any software to control your fans?