One node license is required for every client istance you intend to run (the number of CPU cores doesn't matter). In most cases, you will need exactly one license for each render node you have in your farm (an extra server license is not needed).
RenderPal V2 is a professional Render Farm Manager, dedicated to managing network rendering across small to large render farms. RenderPal V2 offers unrivalled functionality and a wide range of features, delivering an enterprise-level solution for distributed rendering. From the artist's workstation to the various rendering nodes, RenderPal V2 takes care of the entire rendering pipeline.
Supporting a large number of renderers and compositing applications out-of-the-box, including Maya, Mental Ray, Softimage/XSI, 3D Studio Max, Cinema 4D, Maxwell, Modo, After Effects and many more, RenderPal V2 is the number one choice for a solid, powerful and easy to use Render Farm Manager.