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From what I can tell, I think all the boards are the same, they just either have all 8 NANDs populated or only 4 depending on config. I doubt anything would change in that regard, so it would be safe to assume that 2TB and lower will use 4 NANDs, and 4TB/8TB will use all 8 as usual.

You are most likely correct in that the passive components will also be missing for the second set of 4 NANDs on modules originally configured with only 4 NANDs.
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What do we make of this? These are photos from someone in China saying he offers upgrade service for up to 4TB, not much more details. The board doesn't look like there are spaces for 8 NANDs? The area with black tape intact also seems untouched. The fact he only does it to 4TB not 8TB seems to suggest Apple actually starts to use 2TB NANDs, so there are no 8 NAND boards?
 

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If apple uses 2tb nands they could offer the m4 with 4 tb. But i am afraid puting the 2tb nands in the m4 will not work.
 
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What do we make of this? These are photos from someone in China saying he offers upgrade service for up to 4TB, not much more details. The board doesn't look like there are spaces for 8 NANDs? The area with black tape intact also seems untouched. The fact he only does it to 4TB not 8TB seems to suggest Apple actually starts to use 2TB NANDs, so there are no 8 NAND boards?
Need to see a pic of both sides of the board with all the tape removed. No such picture has been shown anywhere at this point.
 
Has anyone done bigger tests on speed for different size ssd configs? On Mac Mini M4Pro.

I saw that the 512gb one is around 3000mb sec vs 1tb 6000mb. Kind of odd if is 2x256gb striped, should be same... Am guessing are slower ssd chips?
 
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Is it possible to attach 2 4tb boards to the m4pro mini? From the teardowns of the mini it is difficult to say.
 
Has anyone done bigger tests on speed for different size ssd configs? On Mac Mini M4Pro.

I saw that the 512gb one is around 3000mb sec vs 1tb 6000mb. Kind of odd if is 2x256gb striped, should be same... Am guessing are slower ssd chips?
Some people are getting well over 4000 MB/s out of their 512 GB drives. I'm getting around 3450 MB/s write, but the drive is half full though.

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Need to see a pic of both sides of the board with all the tape removed. No such picture has been shown anywhere at this point.
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Best image that I have seen so far. Still have tape on that area. But this one shows some intent / bezel that seems to suggest they aren't NANDs underneath.
 

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There are no 2TB NANDs that exist, largest capacity per chip is 1TB.
They exist, Apple just hasn't used them in their supply chain.

A further "evidence" is that with the M4 Pro MBP, both 14" and 16" logic board seem there are only 4 NAND pads and that the 8TB is M4 Max exclusive on the MBP. It seems to suggest like the M3 Pro, the M4 Pro does not have enough data lanes to storage controllers that can do 8 NANDs.

What's odd isn't with hardware, but that Apple feels the need to enable a 8TB option on the M4 Pro mini. Whether they created a custom daughter card, or they start using 2TB NANDs, both seem to be too much work just for that.
 

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Okay this is definitive. At least we know the base model M4 Pro 512GB daughter card has only 4 NAND pads. This means either there is another 8x NAND card, or that Apple has started to use 4x 2TB NAND on this same card, for the 8TB BTO.
 
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Okay this is definitive. At least we know the base model M4 Pro 512GB daughter card has only 4 NAND pads. This means either there is another 8x NAND card, or that Apple has started to use 4x 2TB NAND on this same card, for the 8TB BTO.
Interesting, would make sense that they'd use the new K6B3 2TB NANDs (as you posted previously, I wasn't aware those even existed). No way they could fit 4 more NANDs in there. This also begs the question if the K6B3s would also work on the regular M4 (to achieve 4TB). I highly doubt it knowing how these machines are (only allow officially supported configs), but if I can get my hands on some (and they aren't exorbitantly expensive), I may give that a try.
 

Found the guy who successfully upgraded to 8TB. The same M4 Pro mini base he already went from 512GB to 2TB then 4TB in previous videos. No special tricks, all it took was to source the right 2TB NANDs, he said he used Samsung 315.
 
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