Well, its simple enough to get it reattached, but to make sure you dont void any warranties or possible replacement if necessary, contact the seller of the card and find out what they recommend doing 1st. They may just refer you to the card manufacturer, so contact them too........... Anyway, `frag` tape(3M thermal tape for example) would be good to reattach those heatsinks, or for a permanent bond thermal epoxy like Artic Silver2.