I think CPU-Z is correct. And it's 100% accurate. Because this software need identify through the chipset. As far we know chipset is place of identity, and it can not be forged, because it is manufactured by factory. But if you want to identify from outside / box or hardware, you need "EAN code" , like this post https://forum.ethereum.org/discussion/11227/spot-samsung-and-hynix-memory-before-you-buy