GPU heat?

I've had my nvidia geforce 8800 gt for about 5 years. Just replaced the thermal grease tonight and decided to see whats what. DL open hardware monitor to see max temp etc for my system. My GPU came up with this for the max while playing Skyrim:

Temps.

GPU Core: 97 Celsius
GPU Board: 71 Celsius

Load:

Core: 99%
Mem. Controller: 61%
Vid. Engine: 0%
Memory: 99.9%

Fan:

52%

Obviously this game is over the head of the card, however, what bothers me is that the fan is only operating at 52%. Any insights (other than 'you need a new card')?