i know you said you arent going to get a new card, but im going to suggest it anyways
any money spent on that card is wasted money when it could be added towards the cost of a new card
a 50 dollar ti4200 or ti4400 will rip that card to shreds with only an additional 30 bux (plus the 20 u were gona spend on your current obsolete card)
anyways to answer ur original question, just use some artic alumina and epoxy an old cpu hsf on there