The ODROID-C2 is powered by an Amlogic S905 SoC that provides four Cortex-A53 cores and a Mali 450 graphics processor. The board has 2GB of onboard DDR3 RAM, HDMI 2.0, Gigabit Ethernet, four USB 2.0 ports, and an eMMC socket. It's not a bad little board for $40 USD that's ARM 64-bit and at least has 2GB of RAM, which is a much better bargain than the HiKey 1GB for $75 or HiKey 2GB for $99 USD. Of course, nothing like the speed though of the Jetson TX1 powered by Tegra X1 SoC.
While the board isn't shipping until next month, it appears Hardkernel or one of its affiliates have begun uploading ODROID-C2 benchmark results on OpenBenchmarking.org. Check it out if you are interested in the ODROID-C2 / Amlogic S905 performance or wish to see how your own Linux x86/ARM systems compare performance wise to this $40 single board computer.