Just goes to show that observing a seller's feedback alone is insufficient to determine if what you buy is the real deal...I purchased two x 68040 40mhz CPUs, supposedly L88M from this eBay seller:
1PCS MC68040RC40A MPU ColdFire Processor RISC 32bit 40MHz 179-Pin PGA Tray | eBay
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They are not legitimate. They are remarked fakes. See attached photos.
When viewing your photos, @Mr. Fahrenheit, what specifically must web observe which proves they are fake? (I ask out of ignorance here... not trying to be argumentative.)
Also, what happened with those CPUs in your testing? The reason I am curious about that is because, as you know, I purchased a 40MHz rated 040 from UT Source and found the markings came off after @Kay K.M.Mods applied a heatsink with 2-sided thermal tape and then later removed it. The authentic chip markings won't come off like that, proving it was remarked. However, despite that serious warning sign, I was able to overclock it with Spicy O'Clock to 49.2MHz using your 60ns VRAM (and also that of Drake), and later I was able to overclock 1MHz higher with the 2-chip low-latency SMC VRAM. In other words, despite the remarking (which means I have no idea if it was originally a 40MHz rated or 33MHz rated chip), I can overclock it to amazing speeds, and the temperatures never rose above the 60's°C.
So in my mind, I view the remarked chips in two categories: (1) remarked chips that are known to be low-megahertz and cannot be overclocked very high and/or get very hot, and (2) remarked chips that can be overclocked and don't get very hot. Maybe even the sellers don't know which category they fall into, assuming the sellers weren't the one's who remarked them. Maybe they bought a bunch of old chips from another vendor on the cheap and then just resold them?
All said, it would seem that the only way to know what your getting is to get an authentic chip, and then main way to guarantee that is to pull it from an old Quadra or another 040 Mac or Amiga. But few people would probably do that, as such would render that machine unusable. Then again, I am willing to sacrifice a Quadra 630 to donate parts (like a speaker for the stereo mod) into a Color Classic because the Color Classic is the better machine overall. I did just that a few months back in fact (just haven't made the video yet).