AMD Opteron A1100 Series SoC specifications:

    Up to eight ARM Cortex-A57 cores with 4MB shared Level 2 and 8MB of shared Level 3 cache
    2x 64-bit DDR3/DDR4 channels supporting up to 1866 MHz with ECC
    2x 10Gb Ethernet network connectivity
    8-lane PCI-Express Gen 3
    14x SATA 6 Gb/s ports

en fr :
http://www.hardware.fr/news/14483/amd-lance-ses-opteron-a1100-arm.html

environ 150$ le cpu