"This is some very bad news -- thanks to Tim for alerting us. Rather than paraphrase, I will just quote his email:
'Well it looks like they [fake Athlons] have hit Australia I just recieved my K700 from [an undisclosed source] in perth and have opened it up to put the cold plate on it and to my horror the cpu is a 650 ... the resistor has been changed and serial numbers do not match ...'
We managed to get some pictures of the Athlon in question, and all the pictures are posted, including a summary with each picture, and help for those interested in finding out if their CPU has been tampered with.
More details are available on our frontpage.
We are working on finding an easy way (ie, for 'general' consumption) for those possibly affected to test their processor, and any updates will be posted, again, on our main page :)
The well-labeled pictures also serve as a primer to understanding the cryptic labels on the side of your processor. But as Lucien points out, checking this out will void your warranty.