[zero_custom]

I'm looking into building a new computer to be able to do better 3d work as my current laptop does not support what I need to do.

I was wondering what is the maximum amount of ram that the computer will be able to use to not overspend on resources I don't need.

I was looking into building a system very similar to
http://pcpartpicker.com/b/YDd6Mp.

The basic build is as such
-two(2) e5-2680v3 cpus

either a
https://www.asus.com/us/Motherboards/Z10PED16_WS/ which has 16 ram modules and support up to 1024GB ram
or

https://www.asus.com/us/Motherboards/Z10PED8_WS/ which has 8 ram modules and support up to 512GB ram

-max ram.

I read that on some computer sales sites that the maximum 2 cpus systems can support is 192GB ram and that is amounted to possibly 12x16GB ram.

Here it mentions that
http://ark.intel.com/products/81908/...Cache-2_50-GHz
each cpu can handle up to 68GB.

so 2 CPUs would be 68X2 = 136 GB.

for the
Z10PED16 motherboard,
closest configuration would be
16GB x 8 modules =128 GB
+
2GB X 4 modules =8 GB.
or
16GB x 12 modules =192 GB
+4 free modules

so my questions are
-if the 2 cpu can only use up to 136 GB ram
why can the motherboard support up to 512 and 1024 GB ram. is my analysis wrong?

- what is the best configuration of ram that I should get for the Z10PED16_WS motherboard

- does having extra ram support any other processing or is it wasted?

thanks for your time