For this series you need to take a X299 motherboard like those : https://www.digitec.ch/fr/search?filter=t_746%3D509291%2Ct_12%3D353496&q=carte+m%C3%A8re
For the memory it's up to you but those card can support until 256Go for the highest models and can reach a frequency of DDR4-4266Hz if you overclock it.
The two middle range models can have DDR4-2666Hz and can also reach 4266Hz if OC. (Standard is 2666Hz) With 256Go of RAM. For the quantity it's depend of what you may need.
For exemple :
- Games, photos : 32Go
- Video, music, 3D : 32-128Go
The main difference will be into the connections, Bluetooth..
The difference will be that the 4.8GHz is wrong and that someone at Digitec made a mistake.
https://ark.intel.com/content/www/de/de/ark/products/198017/intel-core-i9-10980xe-extreme-edition-processor-24-75m-cache-3-00-ghz.html
The only difference between the two products should be that this is a retail/boxed version and the other is a tray version.