All of the ECC capable DIMMs AsRock validated are only 8GB per DIMM from what I read. I don’t know but at these prices, I would be satisfied with 64GB, personally. 
ITX MBs only have 2 slots… 
ITX motherboard for Threadripper?
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eventually I hope… Threadripper and Ryzen should share the same compatibility of ECC memory.
It doesn’t. The physical die of Threadripper is far bigger than Ryzen so it won’t fit in the socket, don’t expect anything smaller than micro ATX from Threadripper.
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I dont even think that manny m-atx boards are going to happen.
Allthough its possible, but it wouldnt make any sense.
Sorry , didnt mean for you to think the socket of the CPU
I think AsRock’s X299 mobo is about as far as ITX motherboards can go, and the X299 socket is 2066 pins vs X399’s 4094 pins.
I wouldn’t get your hopes up lol. We haven’t even seen mATX TR4 yet, so ITX is definitely a long, long shot.
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Well the TR4 socket is just so huge that its just unlikely we ever going to see a itx board for it.
Next to that, you also need an 8 phase vrm design, which you eventually could do with an add-in board.
But still…, there the socket is just too huge, and it would not make any sense to develop either.
Even if they could technically do it, it would just cost way too much money to design and develop it.
They never gonne make that money back, so it wont be interesting.
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A ITX TR4? For what possible use case would that ever be for?
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Notebook form factor portable rig?
Dunno…
I think so too. I feel like an mATX board for Threadripper is crazy enough already. 
Scale out storage nodes for zfs cluster…
Probably be fine using Ryzen 3/5… guess if I want ITX thats the best bet.
Asrock X399 Taichi vrm overview.
Also counts for the X399M Taichi.
Main cpu Vcore vrm.
- pwm: IR35201 in 8+0 phase mode, so 8 true phases.
- powerstages: IR3555 60A fully intergrated powerstages.
- Inductors: 60A.
- output caps: Tantalum´s.
Soc vrm:
- pwm: a second IR35201 pwm is providing 3 phases for controling the SOC vrm.
- powerstagesa: IR3555 again.
Memory vrm:
- pwm: 2x uP1647P pwm’s providing 2 phases for each set of 4 dimm slots.
- mosfets: Sinopower SM7341EHKP dual-N Mosfets.
So thats why Asrock is marketing it as an 11 phase board.
Because there are two IR35201 pwm´s on it.
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Gigabyte Aorus X399 Gaming 7.
Main Cpu Vcore vrm.
- pwm: IR35201 8+0 phase mode.
- powerstages: IR3556 50A.
- Inductors: 76A Cooper bussmann.
- output caps: Tantalum’s poscaps.
SOC vrm:
- pwm: 2 phases controlled by a second IR35201 pwm.
- powerstages: IR3556.
Memory vrm:
- pwm´s 2x IR3570 in 2+1 phase mode.
providing 2 phases for each set of 4 dimm slots.
And the +1 rail is used to controll DDR4 VPP rail. - powerstages: IR3553. 40A
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Dont be fooled by the gigabytes 10 amp less per stage… the inductors really matter alot… the 76A Cooper Bussmans will probably make the Aorus edge the taichi
Shame they don’t specify what tantalum caps they use. They are one of the most important parts of the system and one of the most likely to fail or age and go out of spec over time.
I wouldnt be too concerned about that.
I would have liked to see IR3555´s or IR3575´s rather.
But Gigabyte is using those IR3556’'s on allot of their higherend boards,
like the Gigabyte X99 SOC Champion for example.
They are basiclly decent enough, but yeah there are still beter powerstages there.
The IR3575 60A 125°C and IR3555 60A 125°C powerstages are pretty much the best in the buisness.
Asus loves to use those IR3555’s on their topend Rampage Extreme boards,
and their topend gpu´s.
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If only the catered to the wishes of us power delivery puritans
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