The cheapest graphics card you can play it on is an NVIDIA GeForce 6100. Stash system requirements state that you will need at least 4 GB of RAM. Additionally, the game developers recommend somewhere around 6 GB of RAM in your system. You will need at least 2 GB of free disk space to install Stash. To play Stash you will need a minimum CPU equivalent to an Intel Core Duo T2050. However, the developers recommend a CPU greater or equal to an Intel Core i3-530 to play the game.
Stash will run on PC system with Windows XP and upwards. Additionally it has Mac and Linux versions.