No special tools, just a plain small screwdriver. It looked trick first, but was quite easy once i dug into it. It just needs some cleaning before applying new paste. btw: the (don't really now the word in english) connector from the NV5 isn't the same as the Leadtek. So i carved it a bit with a kni...

I have exactly this combination. Works like a charm. I made an attempt to replace the original heatsink but ran out of time and put it back in the case. What i forgot to reattach was the cable to the fan but the fairly large heatsink kept it below 85°C all the time, even while gaming, so i guess i w...