Yes if you take 3 z9 mini and overclock them you can easily reach 40k. So is it 3 z9 mini glued together for the price of 4 or really 4 z9 mini?
More like 4 z9 minis glued together. Now overclock that. I'm pretty sure the z9 overclocked will do well above 40k
The form factor looks like 2 minis glued together. I'm quite skeptical about its overclocking potential.
Yep. I'm in this camp too. I am going to predict right now that each board has 8 chips (twice the mini) for 24 chips total. At 40k sols that's 1.6k sols per chip. Right now my mini gets 16.5k with 12 chips so 1.3k per chip. And the limiting factor seems to be voltage. Getting 1.6k per chip seems pretty realistic when you can already get 1.3 on the mini.
If the double size board added just a couple extra chips for a total of 10 chips per board then you would get 30 chips doing 40k sols or 1.3k per chip exactly which is right where my mini tops out in OC. Either way that doesn't leave much room of OC.
Given that the board is only twice as big as the mini it's pretty hard to suspect that there would be room for much more than twice as many chips.