4-core (5-core?) 1.5Ghz, 8GB DDR4 ECC RAM, two PCIe slots (one one-lane and one two-lane PCIe 2.0?), SATA, gigabit ethernet, microSD, HDMI, UART.
https://www.sifive.com/products/hifive-unleashed/ https://www.crowdsupply.com/microsemi/hifive-unleashed-expansion-board 21 more available in lower link, to the lower right. Great to see it happen finally. Joseph