I've sent it back to Asus and they replaced the ECC bios chip.
Few days later, same situation happened again after pc crashed.
At beginning, my screen was freezen and I push the restart buttom.
Bios show that one of raid disks missing. So I replugged the sata line and restart.
Still, so I do again. And then things happened. Nothing but fan was still screaming.
I think that's because I could not stand the blank screen and unplugged the power as the Asus cpr was trying to recover datas.
Anyway, the Asus Royal Club is on holiday these days. I hope they won't blame me a lot and help.
lalala~