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http://www.hardkernel.com/main/products/prdt_info.php?g_code=G150229074080

 Samsung Exynos5422 Cortex-A15 2Ghz and Cortex-A7 Octa core CPUs
* 2Gbyte LPDDR3 RAM PoP stacked
* SATA port for 2.5inch HDD/SSD storage
* Gigabit Ethernet port
* USB 2.0 Host
* UHS-1 capable micro-SD card slot for boot media
* Size : 147 x 85 x 29 mm approx.(including Aluminium cooling frame)
* Linux server OS images based on modern Kernel 4.9 LTS
49$