Just when you thought Raspberry Pi couldn’t be knocked from its market-leading perch, along comes Asus with a rival device that may give the Pi a run for its relatively little money. Asus just launched its own low-cost computer, the Tinker Board, which is being sold in the UK and continental Europe for about $57. Its features could interest open source enthusiasts in doing a little comparison shopping before deciding on a new device. The Tinker Board features a quad-core 1.8GHz ARM Cortex A-17 CPU with ARM Mali-T764 graphics.