i asked the same thing from Bitmain support and they reply this

 
Nick (BITMAIN)
Aug 16, 2022, 15:47 GMT+8
Dear Customer,
1.   Each S19 Hydro or T19 Hydro has 4 hashboards.
2.   The chip model of S19 Hydro or T19 Hydro is BM1398BB, there are 104 chips on each hashboard, and a mining machine has a total of 416 chips.
3.   There is no special difference between different water-cooled miners except for the model, hashrate, etc.
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hi

Did you see the pictures in those links i sent ,

if this is true that T19 and S19 have same chip , same number of chip used in one device and ,etc

how could this happened that more frequency , more hashrate , less power ?

https://www.zeusbtc.com/Upload/image/202208/16595181831684827.jpg

some thing is not correct in my opinion .

could anyone tell me what is the chip used in this device ?

in product specification not mention any type of this information like how many hashboard it has or how many chip is used in this . not even the frequency .

but i found a picture in product manual , but I'm not sure it's correct or not .
https://postimg.cc/LgLSvhRK

in this image i see 4 hashboard , each has 104 chips that works in 550 MHz frequency .

please let me know if this info is correct or not . and if you know what is the difference with S19 Hydro 3950$ with same amount of the hashboard and chip with little more frequency 600MHz .

https://postimg.cc/RNCdmy6K

is S19 Hydro use another type of the chip ?

please let me know what you think ? i am interest to but more than 100 pcs and if anyone want's 1 or 2pcs , i'll be happy to sell you when i get my shipment .