Traditionally, gaming PCs arent built with size in mind, but Valves Steam Machine initiative has changed the game — now these rigs are taking up residence in the living room. In fact, thats exactly what Maingears Spark was built for. This diminutive PC is built from notebook components: a 3.1GHz AMD A8-5575M processor with Radeon R9 M275X graphics, up to 16GB of DDR3L RAM and support for a 256GB SSD with a spare 2.5-inch HDD tray.