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Is there a definitive way to verify markings are original on these? I have a 40MHz chip identical to these pictures but have not split-tested its thermal performance. I didn't see any trace of scuffing or removal of previous etching, and the print looks identical to the pictures: bolder and more painted compared to the older embossed looking style. As far as I can tell, both styles of markings were used legitimately.   Any tips/tricks?   https://www.ebay.com/itm/193586325333 https://www.ebay.com/itm/323076959423

At one point I had both a Performa 600CD and a IIvx. Both appeared identical inside. For a while that Performa 600 was my only Mac (this was around 1998ish) and it was still just as slow as my friend's was back in 1993. It worked "good enough" as a bridge machine for reading 800k disks though. Eventually it got replaced with a 6100/66 that I still have.

Sounds very cool! Would it work with a Thunder IV GX?

Do you have an account on vtools? PM me with what you want your user name to be and I'll make you an account. We can make a folder for this in the public share, put the software there, and start comparing results.   With MacBench 4 and 5, the results are output as data files that MacBench can read later and you can generate graphis from.   A bunch of the results files are on vtools via AFP, I've put a copy of the software and some files up on my site, it was temporary but excuses to link it keep coming up: http://vtools.68kmla.org/~/coryw/macbench/   The only real reason to bench a 6200 with 68k code is to reveal what we already know: 16k of L1 wasn't enough cache for the emulator, but it would be nice to have numbers.   Good to hear that the IIvx had this happen at both ends. The Quadra 650 created this exact same consternation.   More than anything this seems like a poor ability to plan. Looking at EveryMac, the IIvi and IIvx have the same introduction date (but we've already talked about the problems with LEM/EveryMac/Wikipedia intro/disc dates not lining up and often being based on best guesses mroe than anything else) and the IIvx is actually cheaper than the IIvi (again, same deal). EveryMac also  shows the P600 as being a IIvi (not IIvx, though the P600's page correctly links it back to the IIvx, this errror has probably been in place 20+ years) variant even though the P600 has the IIvx's 33MHz CPU, so.   With this in mind, killing the IIvi makes sense unless the 16MHz CPU really costs Apple enough less to make that it's worth chopping like $500 off the price, for a $2500 and $3000 computer, but I bet that wasn't the case.   This is exactly what I mean by Apple having too many models. This issue extends really far beyond 630/6200/6300 proliferation, which was also a severe and also slightly different overall problem.   There's also the late-stage 7000 issue where the 7200/7500 and 7300/7600 were kind of side-by-side products filling two ends of a single product band for "office desktop" with and without video input, which was nominally either very low-end desktop video and multimedia authoring work or for video conferencing. In some markets (Japan in particular) the 7600 got a /200 variant.   And, there's also the entire existence of the 4400, which isn't entirely justifiable other than as a tech demo for the cloners to follow with the 6360 and 6400 kind of straddling it on either side in price and capability. And, the 5620 and 5280, which was basically a 5300 but cost-reduced with a 640x480 display to be cheaper for schools.   I suspect what it comes down to is mostly that Apple wanted to capture as much money as possible and was doing so at the expense of having a product family that was easy to understand. In adition, I suspect that there wasn't very strong/good centralized leadership within Apple at the time and for Apple in particular the product line needs to be managed holistically from the top, or from a director of all Mac products, instead of by individual product teams.

The ram from my quote above is about $200 for 128MB. 
  I’ve successfully put a SCSI u160 LVD with an SCA 80 to 50 pin adapter in my vintage Macs including the IIfx. I bought a new old stock unopened case of 20x 73GB IBM drives for $140 delivered. 
  if you’re interested in deploying a good, big, fast spinning drive, I can make some recommendations for you.