The cheapest graphics card you can play it on is an NVIDIA GeForce 7100 / nForce 630i. To play Powernode you will need a minimum CPU equivalent to an Intel Pentium 4 2.00GHz. The minimum memory requirement for Powernode is 4 GB of RAM installed in your computer.
Powernode will run on PC system with Windows 7 SP1+ and upwards. Additionally it has Mac and Linux versions.