It does seem as though the problems are isolated still further to HP computers, and there surely can't still be hundreds of thousands of users with AMD based machines continually rebooting, but I certainly wouldn't want to be the one to advise you to download SP3, Kaz, so as Clive said, it's probably best to leave well alone.
What will happen when it comes as an automatic update what should I do then?
As far as I understand it, they've blocked WU from automatically downloading it, but I could be wrong there. I suppose, the safest option is to turn Automatic Updates off.