This article is quite misleading. UDOO X86 does not support 60Hz 4k like article claims. Only 30Hz at 4k is supported. Regular HDDs are not supported as there is no 12V power in SATA connector. Article claims CPU to be 2.56 MHz. That is only the burst speed, with base speed being 1.6 MHz.
I meant.. aren't actually available 2x M.2 slots? I don't know if they meant the only one available for the wifi card...