I haven't got any main dealer warranty on mine and had to pay for it @ Helston.
It's been done a few weeks now and is much better, well worth it. At least Helston seem to be getting the idea now, they had no idea about it until I showed them reams of print outs from various forums!
Im due to have this update done next weekend at AMD, is this something they can actually do? They claim that they have done it before many times, but ive never heard of any of you mention anywhere but a stealer to get it done?