To put this briefly, I'm, looking for the bare minimum system, both in size and cost, that will accommodate two 780 Ti's without bottlenecking. If anyone has some advice I'd appreciate it. Thanks.
AMD CPUs are just bad, unless you are considering waiting for ZEN.
The motherboard has 4 RAM slots, so if 8 is not enough, just get the same one that's in the build and you'll have 16GB(4x4GB).
Another question. What kind of SSD would I need for this if I wanted that instead of a HDD? I see it has M.2 but I don't really understand how that differs from SATA III and whatnot.