You will need at least 150 MB of free disk space to install Slab. An Intel Core i3-530 CPU is required at a minimum to run Slab. Slab system requirements state that you will need at least 128 MB of RAM. The cheapest graphics card you can play it on is an NVIDIA GeForce 6100.
Slab will run on PC system with Windows 7 and upwards. Additionally it has Mac and Linux versions.