The cheapest graphics card you can play it on is an NVIDIA GeForce GTX 970. Kismet system requirements state that you will need at least 8 GB of RAM. An Intel Core i5-4590 CPU is required at a minimum to run Kismet. In terms of game file size, you will need at least 6 GB of free disk space available.
Kismet will run on PC system with Windows 7 (64 Bit) and upwards.