Setup a perfect system right now by the guide, can't be happier, thanks guys!
Intel nuc 5i5ryh. 8gbx2 crucial, 500gb crucial ssd.
install pretty smooth, there was stop sign after 1st pass reboot, tried several more times, it passes and everything goes well.
have to turn off legacy boot when install windows 10, or you'll get partition problem.
after first boot of el capitan, the graphic card doesn't work correctly on my 34inch dell 3415w monitor, after reboot, the resolution setup correctly and very beautiful.
turn on on-board bluetooth in bios, it turns out el capitan recognize it, but can't pair. install additional bluetooth driver by suggestion in this thread, it works!
tried wifi usb adapter from tp-link, but none of them allowed be installed on el capitan, by suggestion from ammulder, found a realteak driver online, it works perfectly now. both WN725N and AC1200 works no problem.