Render Node

Hi,

i want to build one quiet PC (CPU with single GPU, 16GB RAM) and a separate Render-Node (CPU, 3GPUs, 16GB RAM) which will only switched on, when i am Rendering my full animation.
My question: How important is CPU and RAM on the “node” if i use the Cycles-Renderer? Would a 6 [email protected] would bottleneck this Node?