Matt I saw your picture higher up in the thread. You haven't missed putting a heatsink there as there is NOTHING to stick the heatsink to. All that is there is a solder joint where a regulator is missing.
Must be something AMD changed on the cards.
Oh well i put a heatsink there anyway and stuck it on with thermal tape. I guess it can't do any harm can it?
Have you finished your install Taken?