Back in the late 90's there was a serious issue with videocard's and their bios being reflashed to something else. Wish I had the magazines with the articles on it still, but it ended up being a rather large investigation. Happened with ati, nvidia, matrox cards quite a bit.
There was also the massive, and I do mean massive counterfeiting of fake Intel and AMD cpus, the most common thing that was done was resilkscreening the cpu. They would turn around and take a cyrix, or lower end amd/intel cpu scrub off the designations, then reapply them, and sell them back on the market. You didn't know that they were fake until you plugged them into the motherboard and surprise that $600 intel cpu was a resilked el-crapo cyrix chip.
In all these cases, the primary source for these were from SE-Asia, mainly Thailand, and Vietnam. It was so bad, that these things were showing up in legitimate supply chains from major distributors like Ingram Micro, Supercom, etc. Even the packaging was legit, serial numbers on the packages were legit, so it was a very well organized scam.