Whether the 24 gb memory capacities to work optimally on the mainboard that can hold 24 gb of memory capacity?

You don't need 24GB of memory nor 980x CPU for graphic rendering plus, what you need is; a 64 bit operating system + 8GB RAM + workstation graphic cards such as (ATI FirePro V7800 2GB 256-bit GDDR5) + i7 930 CPU (you can overclock it to gain better performance).