For this series you need to take a X299 motherboard like those :
https://www.digitec.ch/fr...
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..
