Question DDR5 Memory Sizes & Xeon W9-3495x Processor

[CNMNJ609]

Contemplating a crazy build for high end creative use. (Workstation) - Per intel's site the Xeon W9-3495x will support up to 4TB of DDR5 memory and the ASUS PRO WS W790E-Sage SE motherboard can support up to 2TB of DDR5 memory. (I was thinking 1 would be enough - lol). Considering the motherboard has 8 DIMM slots where does one purchase the magical RAM the size needed to accomplish reaching such heights of RAMDOM! I am not math a savant but .... if 1TB = 1000GB when divided by 8 slots I would need individual DIMMS of 128GB a piece. The highest I've encountered is 32GB. I mean how do they even REALLY know it will support such levels? What are they testing with? (Confused)

 

[CNMNJ609]

Well shake my head - I found some DDR4 memory @ 256GB per stick. NOT CHEAP!
$7899 for 1TB and $15797 for 2TB!

https://www.amazon.com/4x256GB-DDR4-3200-PC4-25600-Registered-Workstations/dp/B08F2V9QZ9?th=1