Guys beware of buying any ROG notebook, they've a BIOS bug. Changing the boot order with the ssd+hdd results in a black-blank screen after POST. Even resetting / hard-resetting the BIOS won't work if that happens. I can confirm that the following models have this issue:
g551, g751, g752, gl552, and a few more.
The bug is reproducible but it'll result in bricking of your laptop.
I'm in the US now and it's been 2 weeks and still under repair/RMA, i guess they've ordered a new BIOS chip for it.
The asus rog forums and other forums are riddled with people posting about the same issue. There is no bios update to fix it yet, I had the latest BIOS.