What an interesting like you've posted there.
Got no concrete stuff here my friend..just my own thoughts.
I don't think engineers could actually "clone" one of AMD's chips, so it looks like they're unclocked and/or overclocked, possibly with their OPN numbers replaced with fakes.
With the new Duron's it's pretty easy to get a 1600 or 1800 to run several hundred MHz higher with overclocking and make it appear to be like an XP2200+ (PC Chip's boards even encourage this), but how they'd go about hiding the L2 cache issue and some pencil marks, I'm not sure!
With the Athlon I presume they'd just go about unlocking the favourtite models that can give most headroom - namely the 2500+ but that may not be the case.
The only thing I would suggest is to look at the OPN (Ordering Part Number) on the CPU itself to see if it matches up with the information link below; how easy it would be to erase this on the chip I don't know, but all Athlon's and Duron's give different part numbers:http://www.amdboard.com/amdid.html
Hope this info is of some help. It is a pity that the report didn't point to any giveaways so that you could quickly identify whether your CPU is fake either through visual inspection or a piece of software. Maybe the OPN sticker looks like it's been replaced with a suspect one?
. AMD CPU Data: http://www.tomshardware.com/20.../amd...ult/page23.html
. Belarc Advisor: http://www.belarc.com/free_download.html
. GPU Comparison for Laptops: <a href="http://www.notebookche