To use an adhesive compound is not an alternative, becuse I want to have another chance if something goes wrong. Now I have also chosen to wait with changing the cooler, probably till after the summer. But if anyone else have any ideas about which cooler will work the best, I would like to hear.
Yeah, once the adhesive compound has stuck, it's quite difficult to detach the HS without possibly destroying the naked chip.
Judging by some photos of your motherboard, it looks like the NB heatsink is attached to the board by two plastic push-pins**, rather than the hook solution Revoltec is using. Which means you have to remove the motherboard from the case to access its back, otherwise it will be very difficult to detach the existing heatsink unless you want to cut away those plastic push-pins and leave the left over parts rattling inside your case, which of course isn't recommended.
** I have no idea if the AMD's version of the push-pins work in similar manner as the intel push-pins
Once the mobo has been taken out from the case, you have to carefully flip it over (I held to it with my hand, balanced it on the side, the IO-ports worked fine as handles) and locate those tiny plastic push-pin heads protruding on the back - the "heads" look like blunt arrow heads and have to be squeezed together in order for them to let go of the hooked grip and slide through the motherboard.
Those can be little tricky to flatten. I successfully removed my NB HS by using a pair of tiny tweezers to flatten those arrow-heads but be careful not to slip and scratch the mobo! It took me 4-5 attempts, those plastic "arrows" can be tough to get a grip on.
Also always remember the risk of ESD!
Once the hooks/arrow-heads have been flattened, you simply push those through the holes and the HS will come loose. Be careful so that it doesn't unexpectedly fall out and hit some sensitive stuff on the mobo.
I suggest you check again and see how the heatsink is attached to your mobo, but I'm pretty sure it's not using the Revoltec's hook-variant.
If you're using those hooks, you're lucky. It's much easier to remove them than the push-pins.
If your northbridge chipset does get very hot, it will need an assisting fan or another cooling solution such as the
Thermalright HR-05 IFX; pricey yes, and a high riser, but cools much better than those standard square-type chipset coolers such as the Zalman ZM-NB32K. It cools my very hot nforce chipset sufficiently with some spill-over airflow from the CPU fan. You can also attach a slow spinning 80mm fan to it.