Thats a little warm for stock speeds, but it really depends on ambient temp in the room. Its not really warm enough to cause problems, but you'd like to see it a little cooler. One thing that might make a difference is the seating of the heatsink. If you don't want to get a new cooler, it might be worth getting a good thermal compound and cleaning CPU and heatsink to remove the old Thermal compound and replace it and make sure its all seated correctly.