The Steam Deck was the first truly successful handheld gaming PC, but the market had multiple competitors well before Valve opened the floodgates and ushered in a new era of handheld gaming. The granddaddy of them all was the OpenPandora, which came out back in 2010. In 2016, GPD released the GPD Win, the first proper handheld gaming PC that ran Windows and was powered by an x86 CPU.
