94C seems really too hot for a 8800GT. Since it's an older PC, you probably have an old case with poor ventilation. Make sure you have many case fans, at least one in front and one behind to create proper air flow. Or it could simply be the 8800GT fan that got clogged with dust if you never cleaned it since 2008.
Did you check the temps with hwmonitor for your 6990? Since it's a dual-gpu card it's normal that it gets really hot. I guess 80-85C are normal temps under heavy use like during game play.