The cheapest graphics card you can play it on is an NVIDIA GeForce GTX 260, but an AMD Radeon HD 7870 or better is recommended. To play Cities Skylines you will need a minimum CPU equivalent to an Intel Core 2 Duo T7600, but the recommended CPU is Intel Core i5-3470 or better. However, the developers recommend having at least 6 GB of RAM. The Cities Skylines system requirements includes a minimum RAM requirement of 4 GB.